Yikes, a bit over-reactionary in my opinion. If anything, I thought KC's defense stepped up when Mahomes wasn't out there. I'd look at the positive side of even though they didn't win, that game was a lot closer than it should have been. That's a plus for KC, more than GB. Had Mahomes been playing, I don't know if GB wins that game, and I'm a packers fan.
Look at the AFC, it's kind of hot garbage outside of the Pats, and a stretch if you say Colts. If KC was in the NFC, you'd carry a better argument, but they'll be fine for post-season play.