Was this not originally a 4Chan spoof to mess with Pro-Trump Americans? Seems like it has been taken over by Russian trolls to ensure a second term.
The democrats are losing so many voted due to SO-ME influencing.
9gag: Many anti Biden/pro Trump/Anti left/pro right posts from unknown users that with an easy google search are easy to verify as false, but given that many people take things at face value and these posts are presented in a plausible/"generalizing a worst case" people can actually believe it.
Facebook is Facebook and many older people (50+) takes what on the internet for face value
On twitter, the republicans are far more "vocal", and can use a much more colourful wording(sleepy/whiny/slow Biden etc) since they will not lose their most adamant supporters either way.