Are you joking?
Those 3 links are posts from sfogate, a PMCO gate agent, based in SFO, who said exactly what I just said. PMUA agents are working the gates at most stations (presumably with the PMCO hubs of CLE, EWR, and IAH the notable exceptions) with PMCO agents like herself assisting as needed.
And btw UA compensated that OP with $1,000 in vouchers and 25K miles. I'd go through that any day for that!