The Stalin misquote is difficult to deny: "It doesn't matter how people vote as long as [those in power] count the votes."
Also few, if any, election results were truly audited.
There was undeniably fraud. E.g., in Pennsylvania mail-in ballots had mismatched signatures, ballots were accepted beyond the law's limiting dates, ballots with no date were accepted, etc.The fraud was committed by Democratic-party supporting voters, judges and local voting officials.
https://townhall.com/tipsheet/katiepavlich/2020/12/07/mark-l...
Mail-in ballots are an invitation to fraud and now that the Democrats got away with it bigtime in 2020 the floodgates will open in 2022 and 2024 producing a flood of fraudulent mail-in votes in other states where Dems will do their best to pass and modify (by legislative fiat or court order) similar mail-in voting laws.
The sitting president simply told it like it was.