Putting the cart before the horse a bit there, aren't we?Of course he knew about it. There is documentation that proves he knew about and used Hillary's underground, super-secret, basement server as well, and used it often.
There is no evidence anywhere that all these conspiracies which you so strongly believe ever existed anywhere outside the Qanon Universe. Hope you're not offended if you are Qanon believer. In the latest investigation into the Bidens, Comer seems to have misplaced his star witness, the mysterious whistleblower. SHOCKER!!!!
In a normal world, this stunning addmission would be shocking and of grave concern to Conservatives. Comer and the other Republicans know, however, that all they have to do is stir up a little more trans hate and everything will be just fine!