I heard that if you’re black or in a metro area in a swing state that your vote was likely thrown out through some beurocratic bullshit.

the only thing i've seen backed up is that a bunch of republicans were challenging registration status of mostly minority identities, pretty much all of which were fraudulent, so it's possible that this did influence it, not very significantly im guessing, im also pretty sure as a voter, that if your registration was invalid, it would be very very obvious to you. Everything i know about voting registration informs me that you must do all of this BEFORE election day, im not sure if there are any processes that allow you to retroactively do this, im guessing there are a few, but probably for select circumstances, very unlikely to be those im guessing.

Realistically, they probably gerrymandered and ran aggressive campaigning, which appears to have worked.