No surprise at all. The Gallup poll hits less than 2,000 respondents. The respondents are evenly split between Democrats, Republicans... with a smaller segment of Independents tossed in. Call 1,000 Republicans and the largest segment of them are Trump cultists. They will vote for their "Anointed One". Call 1,000 Democratic voters. You will get a mix between Biden, Obama, Fauci, etc.
Noting in that Gallup poll has anything to do with the Trumplicans' suggestion it would invalidate the will of the People.... Biden's landslide win. All that poll says is that Republican voters are enthralled with Trump. Democratic voters do not limit their accolades to a single autocrat. Some like the job Fauci has done. Some still understand the good Obama did for our Country. And, some like President-elect Biden. Yet, the Democrats would all have voted for Biden... along with a few Republicans... because Fauci, Obama, etc. were not on the ballot.