There was a spoofed message sent to the linuxfoundation mailing list that looked like it was sent by Satoshi through vistomail.com saying that Satoshi was not Craig Wright.
Theymos proved it was spoofed by checking where it really came from. I don't know how theymos did it, but couldn't he also check whether the Satoshi mail we are discussing is spoofed?
Of course he could.
But since the narrative of the message aligned with his own and with plenty of gullible salvationists like Alex hanging on his every word - why would he?