Can you give a link? At a guess, there’s less than 10 of us that post regularly that actually have a vote.
Here's where I posted the poll about why people voted for Biden.
Looking at the numbers now, admittedly the proportion of Biden supporters who said that the main reason they supported him was that he was not Trump may not be "overwhelming" at 56%. However it is the number one reason given, and the next highest reason was well behind at 19% (leadership).
For Trump supporters, "he is not Biden" was in third place at 19% as a reason for voting for Trump.
My opinion is that this shows that Biden supporters were motivated mainly by their opposition to Trump.
Trump's supporters said that their biggest concern with him was that he was "temperamental/rude/narcissistic". That's his supporters saying that.
37% of Trump supporters said they would be angry if Biden won, but 61% Biden supporters said they would be angry if Trump won.
I've just picked a few points out of that post, which in turn picked a few out of the actual poll. It's worth reading more I would suggest. See the link above.