I will also point out that Dragos is not actually a prominent security researcher. He organizes a security conference. He has never presented research at his own conference, or at any other conference, as far as I can remember.
I only say this because people want us to take these claims on faith, citing a credential that he hasn't actually established. Furthermore, his tweets so far seem to be full of rookie mistakes. I've seen a fair number of "security enthusiasts" do exactly what he is doing.