This needs more attention. Here is the key quote:

"The good news is that the Trump team only needs to prove these claims by a preponderance of the evidence rather than beyond all reasonable doubt, which makes it a much easier nut to crack."

As a point of law, this means it will be much easier to throw out the fishy ballots. Meaning, team Biden has to prove that the pallets of midnight votes are good, rather than Trump having to prove they are bad.