1) It was ball to arm. - irrelevant, and debateable
2) VAR should only be used when there is a clear and obvious mistake. - there was, it hit arm, not body as ref first thought
3) The screen was fcuked, thus preventing the ref from reviewing his decision - maybe desirable, but not essential if studio review can be communicated to ref
4) The resulting yellow contributed unjustly towards a red - possibly, but he could have ended up with a straight red.
Any poster defending that is being contrary for the sake of it.
Sorry, just my opinion, not for sake of it, honest