I'm on the fence here, have swung both ways over the past day or so.
There are two elements when analyzing this play:
1. The intent/thought process behind the initial ankle grab
2. Was there anything "extra" (twisting/contorting) after Jones grabbed the ankle?
What Jones did might be a "dirty" play, if and only if, he knew with certainty Burns didn't have the ball. Even then, at worst it's a "dirty" play, which on the spectrum of dirty plays ranks relatively low. I'd put Gronk's body-slam of the Bills' defender several years ago higher on the dirty scale than what Jones did.
But that assumes Jones knew Burns didn't have the ball and I don't know if Jones knew Burns didn't have the ball. There are some angles that lead me to believe Jones would've known Burns didn't have the ball but I'm willing to give him the benefit of the doubt after a blindside hit that he was unaware (or uncertain) of where the ball truly was.
The second element is what happened after the grab itself. I don't see Jones doing much twisting of his own volition there -- in slow-motion it appears Jones is being dragged like a ragdoll. Similar to the "where is the ball" element of this, I'm willing to give Jones the benefit of the doubt that his swinging legs were the result of being dragged along the ground by someone 50 pounds heavier than him who has significantly more muscle-mass/explosiveness.
At best it's a disoriented/unsure Jones grabbing Burns because he thinks he has the ball.
At worst, Jones knew Burns didn't have the ball, grabbed his ankle out of frustration and twisted/contorted to bring him to the ground.
Somewhere in the middle would be Jones grabbing an ankle out of frustration without knowing where the ball was.
I don't know what Jones was actually thinking (nor does anyone on earth other than Mac Jones). Since no one can actually know what Jones was thinking and the video evidence leaves room for interpretation, I'd encourage folks to give Jones the benefit of the doubt because it's perfectly possible he genuinely thought Burns had the ball.
What I do know is that the worst case scenario is a pretty tame "dirty play" in the grand scheme of things, and there's plenty of room to give him the benefit of the doubt if you're inclined to do so.
