That was a flop and terrible call on the field but poor candidate for VAR. The defender clipped his heel. Barely, but it was there, and once that call is made....
Exactly why VAR didn't come into play. Since there was contact, even though it was very slight and negligible (i.e., didn't really effect his ability to make a play on the ball), VAR felt it was a judgment call for the ref and not a clear and obvious error for them to review.
This was purely a bad call by elfaf or whatever his name is. Negligible contact should not be penalized. It's pretty clear Murillo continues to run after the contact and THEN decides he should go down, in stunning fashion.