I don't like how he is facilitating the pivot on the 1-2-pivot-1 by making the lead foot step to the side during the first punch. If the pivot is broken into two parts, the lead step to the side and the circle step, he's throwing: lead side step-1-2-circle step-1.
I think it should be 1-2-side step-circle step-1.
The way he is doing it is both obvious and begging for a cut kick to his lead inner thigh.
What he's doing is pretty standard. The step isn't too big and is just a minor adjustment. People do it all the time.
The biggest flaw is that Guillard isn't turning his foot until the end of his pivots. That means he has to make an adjustment at the end of his movement before he's set to throw a good punch. He's disguising that adjustment with a jab, but he's really not in position for a split second there. He needs to turn the foot at the beginning of the pivot, not the end.