I'm not sure what you've seen but are you sure if you look at it again?
From what I see of the follow through, Tarkowski's foot is well above ankle height with his studs facing Richarlison's leg. As I mentioned, it's more to do with Richarlison pulling his right leg back in anticipation of being clattered into that stopped Tarkowski's foot going into Richarlison's shin and potential serious injury.
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Ah, OK, that clip in the OP link really mistells the story, doesn't look raised, doesn't look like he got the ball. This is more like the angle the ref got and I'm now coming down on the side, given the force of the whole move, of that's a red.