I think he was "concerned with the overarching leftist polemic inherent in The Folk Delusion", inasmuch as he thought it was bollocks. That bit of the song was inspired by an old NME(?) interview with Karl Dallas - not exactly a meeting of minds, as PB spent most of his time slagging off the sub-Donovans, the WMC entertainers and the politicos, while KD spent most of his asking why Bellamy didn't write more of his own songs or play electric guitar.

You're right about the dates, though - I've no real idea what was going on in PB's head in the seventies, but even less of one when it came to 1991.