How far does this go though? Suppose someone has a PhD in, say, social anthropology, and they did ethnographic research for their dissertation. They can do re

How far does this go though? Suppose someone has a PhD in, say, social anthropology, and they did ethnographic research for their dissertation. They can do research, but it isn't really math-y. If they do a boot camp to get the ML/Stats stuff, does that count? Or does "PhD" really mean "PhD in STEM?"