I take it this is like your other statement. You dont actually know the statistical probability and are just saying it to basically mean "man that seems unusual"?
Given the riots at the time, philly was literally on fire, something i never witnessed in my life, it makes perfect sense to me that we saw a record turnout **on both sides**. What i find strange is that despite there being record turnouts on both sides it is only suggestive of fraud on Biden's side.