You are full of crap. What was documented in 1000 mules is SOP for corrupt elections in some of those areas just turned up to 11. There were rumbles of this happening (see the Project Veritas video around that time) but it usually happens at low levels that get ignored. Republicans were actually barred from making complaints by a stupid court settlement some years ago based on a discrimination claim.
The worst accounts of what was done in that election was actually contained in their own bragging afterwards. The Time magazine article about their actions to “fortify” our democracy was pretty damning. The problem is that too many people on the courts, prosecutors’ offices, SoS offices and local election offices just don’t care or actively support what was done.
Yes, it probably cost Trump the election.
No, 2000 Mules did not prove that thousands of mules were part of that fraud, or even that they existed.
2020 was iirc the 1st year for an election sans the consent agreement….in decades. The left has had free reign for a long time.