Austin Butler's pulling an Elizabeth Holmes

It's still wild to me that the guy from Carrie Diaries was not only in a Quentin Tarantino movie, but is now playing Elvis in the biopic about him. But, what's even wilder is that Austin seems to be pulling an Elizabeth Holmes, lowering his voice for... legitimacy? Masculinity? I'm not sure why exactly, but his voice is completely different in all his recent interviews: