[Campion]

The politics surrounding its issuance, Boniface VIII’s condemnation as a heretic by a council of bishops and archbishops and his death soon thereafter on account of embarrassment it is claimed

His condemnation was bogus.

However, Unam Sanctam needs to be understood in its historical context: as a harsh rebuke to a (self-professed) Catholic king, Phillip the Fair. It's not addressing the salvation of non-Catholics (non-Christians, whatever).

Pretty good discussion of all of these issues here.

[Kolokotronis]

“His condemnation was bogus.”

Apparently the bishops and archbishops who condemned him didn’t think so. I have to tell you, C, what Unam Sanctam says sure looks like heresy. That said, I don;t doubt the condemnation was any less a political put up job than Unam Sanctam itself.

“However, Unam Sanctam needs to be understood in its historical context:”

Can we look at the IC and the declarations of Vatican I the same way? :)