The rationale behind that is that, in theory, VAR only sends the referee to review an incident because they've identified something that the referee hasn't seen. So the Arsenal penalty would presumably have gone something like: VAR: "There was a shirt pull, did you see it?" REF: "No" VAR: "Maybe review it on the monitor then" Ref goes and sees it, reverses his decision and gives penalty which, you could argue, is VAR working exactly as it should.Good point. How many times has the referee been told to check the monitor then not reversed his original decision? I can't think of a single one. Even the commentators know and tell us the decision is going to be overturned.
So is the referee actually making the decision, or is he carrying out an instruction? It wouldn't surprise me if Riley has told them, for the good of their career, to reverse their original decision whenever they are told to consult the monitor. And these decisions are actually being made by those in the VAR room. It again raises the question of the role of the mysterious Match Commanders.
That doesn't explain what VAR could possibly have seen in the Jota incident yesterday which is why VAR and PGMOL need to become entirely transparent and fans should have an official explanation of the decision making process.