Tyrann Mathieu's personal foul on the 2 pt conversion

There's gamespeed, what the refs see and replay. It's easy to say what's right and wrong sitting watching in the stands or in front of a TV. The ball was thrown scrambling he got rid of the ball untouched you can't take more than two steps and hit any qb afterwards. It was a late hit simple.
I took another look.

Mathieu was running full speed. Baker throws the ball, Mathieu's back foot from the previous step lands, and he takes one step forward into Mayfield.

I suppose it can be debated whether the back foot landing is considered a step (I don't think it was, I still say he took one step) but there is no way he took more than two.