I hope I'm not being excessively hubristic here but my view is that the charges, while potentially serious in theory, are actually thin.
The image rights stuff (which was the one I was originally most concerned about) was being discussed with us, by UEFA, in 2015. I can't imagine it wasn't also known to the PL therefore, who were the FFP licensor. If UEFA felt we were trying to defraud them (in the criminal sense) then they'd have charged us back in 2018. They didn't though.
With Mancini's contract, that was around 1% of our 2010-11 revenue and about 0.75% of our 2012 revenue. It's hardly Enron levels.
CAS has already ruled that our Etihad sponsorship (a) was broadly fair value and (b) not funded by ADUG, but by the Abu Dhabi government. So I can't see them having much luck with Aabar, that might have been one of the time-barred sponsorships. And Etisalat, the other, had already been discussed with UEFA, according to the CAS output.