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.