We're hitting on a policy change at UL. No, I can't 'document it,' so you'll have to trust my memory.
UL tests things 'as submitted.' If an air conditioner came with a fused disconnect, UL had the nameplate specify 'maximum fuse,' and you were supposed to derive from that that there HAD to be a fuse somewhere in the circuit. Part of this was a carry-over from 'the old days,' where it was assued that the final overcurrent protection would be a fuse.
After all, UL maintained, it wasn't evaluated with a breaker.
Well, sometimes even UL can 'see the light.' UL finally figured out that the folks who make the air conditioners are not the ones supplying the disconnecting means- and there are plenty of disconnects out there that take breakers. Breakers are also readily available to match most any fuse size.
Thus, about five years ago, UL changes its' marking requirements to have the nameplate simply read 'max overcurrent protection.' Fuse or breaker, it doesn't matter.
Older equipment, with the older marking? While there might be a 'paperwork' violation, were one to use breakers alone on an air conditioner marked "Max Fuse," I would sleep perfectly fine with such a unit outside my window.