They were Protopaly's before. Of course, Protopaly included the green and brown button polyps, which take sand into their coenenchyme, so are Paly's. As a descriptor, Protopaly is still around, but it may soon be deleted from the books as a genus, as I understand it. Some that were called Protopalythoa are actually Zoanthus, and some are Palythoa.
To me, all larger polyped varieties (people eaters and brown and green button polyps included) were Protopalys, all smaller zoas were Zoanthus. I only ever thought of Palythoa's to be the ones with the deeply embedded coenenchyme (essentially, a mat with mouths that open-almost no stalk). Everyone remembers the old days differently, though. That's why science is so important...