I have no idea. Sometimes they say it's IFAB mandated, sometimes it's their own stupid internal interpretation.
I can't even think why they messed with handball. Sure, the original rule is ridiculous - as I said yesterday, "intent" is a ludicrous concept on so many levels - but I don't remember tons of controversial handball decisions/non-decisions and we must sort this situation out immediately?!
Ultimately we have amateurs playing a professional game. The fact that the likes of Jon Moss are allowed to ref at an elite level when one glance at the fella will tell you that he's literally not fit to referee, well, it says it all. Imagine having someone of the standard of Bankes or Coote in your respective field at work, they wouldn't last a fortnight, they'd get pied off for being quite obviously shit.
My first step would be to get ex-pros (sensible ones, not your Merson types) doing VAR. It can't be refs backing refs, we've seen it doesn't work.