From Keshel's own words .....
Here is a tale of the tape for Excess Biden Votes based on trend analysis in the modern political era, considering population growth/decline, recent voter history, and registration information, including registration by party.
My estimates are always lenient, and do not account for cyber flipping of votes.
He loaded his estimates using his own theoretical formula to be biassed toward Trump or rather against Biden. .
A right wing web page found it and made it into fact based information.