Hi, yes, that was me! PM me if you need specific POI information; it's a little complicated, I don't really want to post it here, and I think it may also not be relevant. I actually got the email from a professor within the same subfield whom I had not mentioned in my SOP. I study (late) modern European history.
Edited to add: This professor's work is so relevant to my interests that I really probably should have mentioned it, though, so I don't know that it's possible to read much into any of this.