Youtube is not blocked entirely and public wifi is still legal as far as I know. There are still ways to post from Russia to outside platforms relatively anonymously.
However once anyone in Russia views a post, it is reviewed and blocked if does not meet their guidelines. So videos of dissent maybe visible to the outside but not to locals over “clearnet”.
What these exact guidelines are it is not known so I cannot say why certain posts are allowed while others are not.
I have visited since filters were enabled and seen this happen many times