All red cards are reviewed by VAR. I believe Horse means that it wasn't overturned by VAR meant the incident had been checked and was still deemed a red card made them realise (in the moment, before having a chance to see a replay themselves) that the ref was probably right.
I didn't boo, nor did I applaud Andone off the pitch as I saw some doing. But from where I was sat, it looked like both were going for the ball and both expected a collision so both turned their backs, with Valery also dropping to his knee, to protect themselves and Andone fell on Valery. The...