Good lord, dude.
I hope that you respect Chomksy more than Greenwald. Here's Chomsky's semi-famous appraisal of lesser evilist voting (I disagree with it to a large degree, but it's more comprehensive and less reductive than Greenwald's).
https://chomsky.info/an-eight-point-brief-for-lev-lesser-evil-voting/
Also, I have no idea what kind of wacky other-dimensional math you'd have to use to say "2 Biden terms = 1 Trump term." Two Biden terms will result in a mixed bag of slightly better domestic outcomes and slightly worse domestic outcomes relative to where the country was before, with definitively more positive outcomes than negative outcomes and with the end result being that government presently and in the future is in a significantly better place than it was before. The courts would be filled with highly competent centrist liberals that would advance things like workers rights, voting rights, civil rights against government intrusion and recovery rights against corporate tyranny. Environmental agencies would be headed by professionals trained in and disposed toward defending the environment. Consumer agencies would e headed by professionals trained in and disposed toward defending consumers.
A Trump term would represent a wild swing in the other direction toward incompetence, corruption, policy making and executive appointments purely for the purpose of fucking over consumers/citizens/etc. for the benefit of corporations and rich people, and the proliferation of incompetent and corrupt hacks into the judiciary that will pang for generations and continue to leverage the government toward permanent minority rule.
They are not remotely comparable. And this is coming from a guy who really doesn't like Biden and who thinks he's the worst possible outcome of the Democratic field: his history on consumer protections, race relations, and his continued coziness with private capital is extremely concerning to me, as is his ideological commitment to the golden mean. Also, I think you severely underestimate the power/influence of a president's party/supporters on their policy. There is absolutely no chance that Biden would be as conservative as president in 2020 as he was as a senator in 2006.