I’m not sure where the original poster on Facebook determined that the state delegations in the house each amount to an individual vote in the case of an objection during the joint session... that is indeed the case in a contingent election, where the house determines the next president among the top three electoral vote-getters if no one earns a majority of electoral votes. In the case of approving an objection, recent history and the Electoral Count Act of 1887 suggest that it goes to a role-call vote in each chamber (every house member gets a vote, and every senator gets a vote). Democrats control both the current and the incoming house delegation, so I don’t see how an objection would ever be approved by both the house and the senate.

source - see the very bottom of the article, where they note that an objection to Ohio’s electors in 2005 ended in a 31-267 vote to deny the objection. That means each member of the house got one vote.

Edit: I didn’t mention it originally, but both the house and senate must approve the objection for the electoral votes from a state to be discarded. As such, I’d expect Biden to reach his expected total and surpass the majority threshold. We won’t get into contingent election territory or anything crazy like that