Personally, I think that Testament seems to recognize First Strike Still Deadly as a compilation, since their initial plan was to remix the original versions of those tracks to give them a more modern sound, but they described it as being "politically impossible" due to the different entities who hold publishing rights for the original recordings. The decision to actually record the songs again was reached only due to those difficulties.
I do not agree that releases which consist entirely of new versions of older songs are automatically compilations, but ultimately a band determines the category of their own releases unless a record label owns the rights to the recordings and can do as they please.
I do not agree that releases which consist entirely of new versions of older songs are automatically compilations, but ultimately a band determines the category of their own releases unless a record label owns the rights to the recordings and can do as they please.