Absolutely plausible.
Sounds to me like the S1 S2 theory is spot on. This should have everyone questioning their flu vaccines to this point. Everyone I know that has religiously taken flu vaccines has got some sort of autoimmune disorder or other health issue. Now look at this shit when it first hit. Everyone I knew that caught it was a flu vaccine believer. Then those same folks are getting this jab, and look what's happening with the numbers of cases/variants.
If PDJT had never put their timeline on "warp speed", many would've never picked up on this shit. Many still haven't, yet, but the truth will come out eventually.