Having a homosexual "tendency" is not a sin. Many a man may have a "tendency"--- an unbidden appetite, a wondering eye--- to adultery, but never cheat on his wife; many a woman may have a "tendency" to anger, envy, or avarice but never act on them, let alone try to build her life around them.
What these men did in private need never have been any kind of public issue at all --- after all, nobody had surveillance cameras in their bedroom --- but they chose to make it public by having this bogus "commitment ceremony," which is an announcement that "We join ourselves in sodomitic union."
If the Church turned a blind eye to that, the Church would be accessory, enabler, accomplice.
I hope the pastors don't shrink back from their decision to admonish these men, but use it as a "teachable moment."
May the "commitment couple" publicly repent of their error, turn away from their proud sin, and (hopefully) be reconciled with God and with His Church.