If you watch that video it shows the knee going behind the head.
I don’t think the video shows anything definitely, aside from a knee thrown directly at Emmett’s head when he’s grounded, which he had to avoid.
Even if I concede that it didn’t land, I still think that an attempted illegal strike impacted the fight, same with Poiteria.
Would you say it’s legal to say, throw a soccer kick at a downed opponents head, but not intend for it to land, but only to cause your opponent to react to it to set up another legal strike?
If that’s legal, then virtually every fighter should start to use soccer kicks feints to the head to set up their entries to ground and pound.