I had a feeling this would happen, though I thought it'd be quicker, what with Tough Claws having an impact that's arguably even greater than Adaptability on Lucario. I think we can safely assume this would've been done long ago had Steel still resisted Ghost and Dark, though.
As a side note, Serperior and Terrakion are gone from UU, meaning ANOTHER tier change for the former. The only thing left is a promotion to OU, which I doubt will happen. As for Terrakion, if memory serves me correctly it was already BL during Aegislash's reign of terror, so it's nothing surprising.