Saying the way to prevent corruption or slippage is to make the laws clearer is like to prevent crime from happening you have to introduce harsher penalties. You don't need clearer laws to tell the video refs looking at an incident like this to notify the ref, literally every other major league's VAR would have done so.
VAR works fine enough in Germany, Italy and Spain, not without mistakes there either but overall the quality of decisions has improved. I don't know the exact in and outs to every league's implementation but from my understanding it's the same on paper as in England, the video refs point stuff out if it's relevant and tell the ref to have a look if need be, he gets to decide on his own then whether to overturn the call or not.
Refs have plenty of room for interpretation and if you assume a ref acting in good faith it's a good thing too, football is a game of 2x45 minutes on a pretty big pitch you can't write a law for every instance to be enforced. Basic accountability sounds good but what you're suggesting already happens and nothing changes since explaining why you made a wrong decision without further repercussions for the acting ref does nothing to hold someone accountable. The PGMOL has shown every time that it doesn't care or want to change anything, no specification of any rulebook will ever change their work. They have to go.
