I know he has been excommunicated by a couple of bishops, one of them in Denver.
Biden has not received a ferendae sententiae excommunication from any Bishop. You know no such thing.
No, just said he should not be given the Eucharist. Nothing formal. Officially excommunicating a pol. Is very tricky considering the secular nature of our government/tax breaks involved. God sorts everything out in the end, we only go by what integrity we have.