But they're not blagging are they?
Either the terms of reuse were laid out in his original contract and they were asking him to waive them; or they weren't and the band was courteously asking for his permission despite not being contractually obliged to.
As you know varying of contracts and reductions or write-offs of fees happen all day, every day, in pretty much every business and all he needs to do is say no.
From the band's (again, polite and measured) response quoted by Dweller, there was never any intention to deceive and they were simply trying to keep costs down on a project unlikely to make much money. Fortunately it seems that most of the other contributors are happy with what they've already been paid, for a little more exposure, and to get credited for their work.
I'd be interested to know what Pope's original contract said about the reuse of images. If fees were specified which the band were asking to be waived, then he's overeacted and should have dealt with it professionally in private. If no terms of reuse were specified and they were legally able to reproduce the imagery without permission or payment, then he's an utter fuckwit for publicly shitting on a goodwill gesture that they weren't obliged to make, and that kind of behaviour will likely lose him other clients.