I can't remember off the top of my head, but FM only applies to a couple very specific things in the PWA, it's not a blanket get-out-of-jail-free card.
And if Management tried to get out of paying Furlough Pay as outlined in the PWA, ALPA would grieve it and win in a heartbeat. Of all the things to worry about, I really don't think this is on the list. Hopefully, it's all a moot point.