Unlike many folks on this forum, I won’t presume to pontificate on other folks’ beliefs … so I’m not totally clear on the United Methodist perspective regarding communion.
From the Catholic perspective (the only one that matters in this case) denying Holy Communion to Joe Biden, a manifest, obstreperous, and unrepentant public sinner and heretic is an act of mercy. It’s preventing him from heaping a sin of sacrilege on top of his sins of abortion and scandal.
The pastorally-minded priest, in this situation, acted as he was morally obliged to do, in order not to cooperate with three gravely serious sins:
There is a path back to Communion, even for Biden. It involves sincerely repenting and turning away from his wretched, defiling sin; confession to a priest and obtaining absolution; being reconciled to God and to the Church; making due reparation (should include public rejection of abortion), and then being admitted again to Communion and the other sacraments, rejoicing in God's mercy to sinners.
I know and respect a number of Methodists, and I can't imagine this lady pastor's errant opinions count for much with many of her fellow-believers.