To clarify, it's not a story. As I said in my OP, it was a bunch of people speculating, but I happen to think it's plausible assuming -in a world cup interrupted season - that the protocol wasn't set in stone with no ifs nor butts and that there was a discussion involved between the FA, Scottish FA, government and representative of HRH.
Seeing that there was a delay in the announcement with everybody left wondering what was going to happen for around 24 hours(?), I strongly suspect the matter *was* discussed and that the most likely point of concern was some form of tribute disruption bringing shame upon the nation and the memory of the Queen just three days after her passing, with the clubs known not to respect the national anthem being the most likely candidates to cause problems.... and both said clubs scheduled to play at home.
We've become fixated on Liverpool, but Celtic are a more obvious issue.
Before anybody leaps in with any further histrionics, I'm not judging Celtic fans when I say that them being asked to observe a minute's silence for the Queen of the United Kingdom would effectively be a stone's throw away from asking the Republic of Ireland national side to show respect. History being what it is, it's not a reasonable request.
They could have postponed Celtic and Liverpool games only but that would have raised suspicion. I think they had no choice but to go all in or all out. They couldn't possibly throw those two clubs under the bus by declaring that to be the real reason so we're left speculating until they come up with some other excuse or it just blows over.
Tomorrow night will likely reveal whether or not the authorities should have had more faith in the fans to behave in a respectful manner, but all of this could be a mute point if it's a minute's applause rather than a minute's silence, the former would need a sizeable chorus of boos to drown it out and be noted.