Let's reframe things here in part because it's highly illustrative of both the phrases as well as the specific question you raise.
Imagine Andy Matuschak reading Sonke Ahrens' How to Make Smart Notes (CreateSpace, 2017) and making notes on what he feels is important. As he reads, he does what is prescribed, namely, he restates the idea in his own words based on what he's read. In doing this he takes the idea of "evergreen" content from journalism settings (and later SEO settings) which he was familiar with and applies that name to what Ahrens called permanent notes to expound on his understanding of Ahrens! (An evergreen article in newspaper work is an article which was written for a particular recurring holiday, event, or story and is regular. Why spend huge amounts of staff time writing that truly original Valentine's day article? The broad stories about gifts to give and restaurants to visit really don't change from year to year. Just dust it off and reprint it, as readers are unlikely to have saved or remembered it and it becomes free re-purposable content.)
Of course, in rewriting this definition, Matuschak adds in some additional baggage for those who aren't carefully reading his work. He adds some additional emphasis on revisiting one's ideas and rewriting them over time, which is certainly fine, but I think the novice note maker puts too much emphasis on this portion thinking that each permanent or evergreen note must eventually become polished to perfection. In practice, most seasoned writers don't and won't do this. In fact, I suspect if you looked at Matuschak's note on evergreen notes, you'd find that it probably hasn't changed since the day he wrote it other than agglutinating links from other notes.
This doesn't mean that one can't modify or change their ideas over time, this is certainly useful and good, but I suspect that the majority aren't doing it the way that might be imagined by Matuschak's original statement or the way that his idea was picked up by the (niche) digital gardening community and spread primarily in the work of Maggie Appleton. It's some of this evolution of Matuschak's definition which bled into digital gardens, which have some overlap with zettelkasten and the note taking realms, which have muddied the waters. As a result, one should take it as general advice and apply it to their own situation, needs, and practice.
For those who use their own notes for writing, one will often mark their cards/notes to indicate that they've used those ideas in various projects so that they're not actively repeating themselves ad nauseum. Some of the additional tweaks one might make to their notes from a style or context specific perspective are also left to the editing portion rather than being done in the notes themselves. As a result of some of this, unless there is a dramatic flaw in a note, there isn't generally a lot of additional work one would come back to it to revise it. If it does require that sort of major revision, then perhaps the better method would be to make a new note and linking it to the original along with an explanation of the error. I typically wouldn't recommend polishing individual notes to some Plationic idea of perfection. Doing so is often just make-work which distracts from one's time which could be better spent doing additional reading or actual thinking. If you're going to do that sort of polishing work, do it at the end when you've got a longer piece of writing you're including your note in.
The real question now, is how are you personally going to define permanent notes, evergreen notes, or other related phrases like atomic notes? This practice is called by Mortimer J. Adler and Charles Van Doren "coming to terms" with an author's work and is part of their analysis for how one should read a book to get the most out of it. I highly recommend reading How to Read a Book (Simon & Schuster, 1972 or Touchstone, 2011) as a companion to any of the usual note taking manuals.
If you want to continue the experiment on a better unified definition of permanent notes, evergreen notes, atomic notes, etc., you can find a pretty solid bibliography of note making, writing, and reading manuals to peruse at https://boffosocko.com/2024/01/18/note-taking-and-knowledge-management-resources-for-students/#Recommended%20reading.
While one could certainly go down the rabbit hole of reading all these resources, I would recommend only looking at one or two and spending your time working on actual practice. It's through practice that you're more likely to make actual progress on your own problems and questions.
reply to u/franrodalg at https://www.reddit.com/r/Zettelkasten/comments/1azoo9m/permanent_vs_evergreen_notes_am_i_thinking_about/
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