the real brain corals in the sea are actually favites sp. and other genus of favias. large colonies of favia, platygyra, favites etc are all called brain corals.
the fleshy trachyphyllia, wesophyllias seen in our trade are called open brain corals......
google up brain coral to see. TS is technically not wrong in calling it a brain coral.
i am, however, interested in knowing where he got it.
there's no such thing as acclimating a coral to room temperature (rtp). if its alive in RTP, it means it can survive in rtp and doesn't need acclimating, or it's slowly dying but not dead yet, or it's just tolerating the temperature which is not optimal for it's health.
TRUE acclimating would take years of evolution and successive continuation of the species to naturally occur and survive in waters at RTP.