As you may recall, Putin wasn't trying to take control of all of Ukraine back in 2014. There is a difference between what the Russians did in 2014, what they've tried to do in 2022 and the effect it would have on Europe and the rest of the world if they were successful in their efforts.
Current public support for Russia in Crimea largely consists of two things:
-Russians, many of whom have likely moved in since 2014.
-Ukrainians who are at the end of a Russian gun.
I wouldn't take whatever polling is coming out of there very seriously.