I've looked through many different sources and cannot find anywhere where Welch has dumped his shares. He has moved them to protective Trusts, but I can't find out how the heck he is monetizing currently. As far as I can tell, he basically owns most of the voting rights, and has converted a ton of debt to shares, but as far as I can tell, maybe Tanya does her job a bit better than you give her credit for.
Of course, in my opinion, her job does not entail protecting you at all.
P.S....still holding your NVDA short position? Today is 12/4.