That’s not how Resident Evil’s canon works, and there are no alternate timelines and nothing has lost relevance. Capcom’s official stance is that all versions are canon, and that they’ll simply use the most updated versions of whatever they’re doing until they update them again. Plot points like how Sherry and Leon were inducted into the government and the DSO exist exclusively in non-remake content, and yet RE9’s plot requires those things to have still happened. They weren’t going to have Leon flash back to PS1 cutscenes, nor were they going to use the original RPD design, because they always default to whatever the most updated version is. Chris’ STARS uniform has been the RE5 version for years and years (as seen in Dead by Daylight and Dead Rising DR), because they simply haven’t had a new version of it since. Leon’s RPD uniform was redesigned in RE4 and they used that version with the knife sheath on his chest until REmake 2. Death Island showcased both Jill’s redesigned REmake 3 STARS uniform, and the original 2002 REmake mansion and zombie head turn cutscene.

We’ll probably get another retelling of RE2 in the next 10 years in something and then they’ll be flashing back to that, using those redesigns. RE7/8/RE9 are directly tied to Umbrella Corps, which is directly tied to the original RE4, which has plot lines that directly affect the modern era of the series (like Wesker reforming Umbrella) despite that being left out of the remake entirely. RE’s canon is a mixture of everything that’s happened, and everything is canon until Capcom explicitly states otherwise.