Just as a little balance, imho, he isn't saying anything libellous, I don't think. Is he? It may be stupid and annoying as fuck to fans, but I just don't see it.
Let's face it, the PL is effectively accusing the club of fraud around sponsorships and, in my view at least, of overstating sponsorships from related parties. What he says may be stupid and uneducated from a financial standpoint, but I don't see how it is causing any damage in the face of the PL allegations which are specific, well documented, understood by you legal professionals and, of course, actually incredibly damaging merely by being alleged.
I may be wrong, but it seems to me he is just a stupid, bitter old man shouting into the wind of the PL allegations.
Best to ignore.