I'm a little more sympathetic to the OP than others. The way I understood the post was that the defense wasn't necessarily gassed, or that Mahomes had cracked the code on their scheme, but that they'd remained competitive apart from ill timed penalties, so they had a shot at a stop in overtime. This seemed directed at Chiefs fans who claimed that if they won the coin toss, it's game over in their favor.
Where I diverge is that we can't possibly call it good defense, since they didn't do their job (even if that pick play was egregious). To their credit, however, they weren't outmanned, and I think Flores would have come up with a decent playcall to get a stop if they stopped the sloppy penalties. But that's pure conjuncture.
Thankfully, none of this matters. SB bound, baby!