Depends a lot on locale. Since they live in the NY/LA bubble, it makes sense they would say 2 years because teachers fought like crazy to not go back to the classrooms in NY/LA and it really did linger for about 2 years. For many, it disrupted 2 school years. So in any case, it's not exactly right or wrong to claim 2 years.
I don't think whoopi tried to rewrite anything, she came across like she was still willing to die on the hill of COVID lockdowns even though most now recognize how wrong that was. I don't think she changed her position at all though, at least from that clip, and I actually give her credit for sticking to her guns, even though I obviously disagree with her position.