Not a word of that is true.
It is entirely true.
If the American people believe the President is illegitimate - he is out of there - and Constitutional process technicalities are not going to protect him.
And the converse is also true.
If the American people believe the President is legitimate - he will remain - and no Constitutional process technicality will be enough to remove him.
Want proof? Barack Obama is the proof.
Technically, according to the Constitution, he was not eligible. Yet, he served 8 years.
Why? Because there was insufficient popular support for disqualifying him.
Want more proof? Donald Trump.
He won the 2020 election, and yet Joe Biden got sworn in.
Why? Because there was insufficient popular support for the notion that the Democrats stole the election.
Unfortunately, the force of public opinion is more deterministic of political outcomes than is strict adherence to Constitutional process.
If enough people are convinced that Biden is there illegitimately, he won’t be able to withstand the pressure to pack up his things and go back to wherever.
I doubt that many people can be convinced, but if they were - he would certainly be forced to step down - and it wouldn’t require any fancy Constitutional legalities - it would be like booing someone off the stage.
Enough booing is all it takes - you don’t need force or legalities.