I know the authorities mentioned a discord chat with his roommate, but IIRC they didn't say it was an Antifa chatroom. Malone (IMO) makes the same mistake that the ATF did yesterday, assuming the Helldivers memes were Antifa messages.

I'm sure antifa is a smaller deal in Utah than in Portland, but here we know the names of almost all the freaks who riot in the streets, the police just don't do anything about it. But so far, no footage of him at an event or anything as far as I can tell.

Edit - just rewatched yesterday's presser. The officials say he was on discord but never mention antifa or antifa chatrooms.