3rd party creators are just fans who are publishing RPG books, and like the rest of us, have a range of opinions on the game changes and what we should call them. I chuckle at how some creators are handling this on various Kickstarter projects.
The ones I respect simply say something like . . .
- Compatible with 5E, the world's greatest fantasy roleplaying game! This project was designed before the new 2024 5E revised rules were released and do not take into account any changes. However, we're confident our project is fully compatible! After we get all 3 new core books and have a chance to process the changes, we might release an addendum if we feel it necessary.
- Or . . . Compatible with 5E, the world's greatest fantasy roleplaying game, both the 2014 5E rules and the new 2024 5E revised rules.
I've certainly seen some tortured statements that confuse the issue, or insist on odd nomenclature like 5.24E or even 6E!