He's going to make sure Biden doesn't get a sniff of anything until January 20, and then the Republicans will blame Biden for not having his Cabinet all ready to go on that day.
Never mind that they'll stall the appointments in the Senate and that Trump had almost nobody picked up by his inauguration and that it's because of Trump and his administration that Biden's prospective Cabinet Secretaries can't get vetted for security clearances...
It's the same playbook as Republicans use on the deficit. When Republicans are in charge, run up the deficit because that stimulates the economy. When Democrats are in charge, deficit-shame them into cutting spending, which slows the economy. Then remind everyone how good the economy was when Republicans were in charge, and run up the deficit again.
EDIT: For that matter I wouldn't put it past Pence to twist the Electoral Count Act into knots if he can find a way to manipulate that into keeping Trump in office.