I don't know if anyone here follows Jamie on Twitter, but apparently he deleted his account and created a new one on July 1. However, on July 16, Kaya tweeted this:
Screencap Kaya's twitter "Jamie's" twitter My only guess is that Jamie tried to delete his twitter and someone hacked into it, there are no other links to it. And this person is just trying to add fuel to the series 7 fire (he/they also tweeted, "Look like i may have to delete my Twitter again, Too much hate."
Maybe the real Jamie did get backlash for series 7 and deleted for those reasons, either way I'm going to miss his King of the Hill icon.