Sure, and I wasn’t trying to sound aggressively opinionated. Rather that this is not just my idea, its a pretty core idea in modern zettelkastening/digital “gardening”, which is where the entire concept originated. Andy Matuschak was the most likely originator of the term “evergreen note” and in his livestream he is editing evergreen notes to incorporate new knowledge.
So I mean, yeah, you certainly can use the term however you want, but keep in mind it will result in some misunderstandings and miscommunications because of your choice. Even with subjectivity there are generally accepted terms and meanings, and yours is very different from the norm.
Personally I would consider an “unchanging note” to be more like a published output, even if I’m the only one who will ever read it, and move it to a separate folder. That helps avoid confusion. But of course you are free to call them whatever you want, subject to the potential misunderstandings described above. ¯\_(́ ◡◝ )_/¯
(Technically I do this myself, with my “literature notes” being different from the norm, but I’m finding to an increasing degree this distinction is artificial and may not be adding value, and it adds to confusion in discussions when I try to explain it, so I’m experimenting with moving away from it and adopting the more standard definition instead – which is another reason I’m recommending you consider the potential for confusion, it is based on experience)