Trump is (no doubt) the biggest influence peddler American politics has ever seen. The full extent of it will likely not come out until years after the election.
But if what you say about Biden, above, is true, it could turn a lot of voters who expected more. Just saying.
Anyone who this influences was either already voting for Trump or looking for a reason to vote for Trump. This is comparable, to say, complaining about one person getting a speeding ticket while someone else has committed arson. Trump has basically burned down every norm that we expect from political leaders. This isn't about policy debates, it's about do we require normalcy and do we maintain a legitimate democracy?