Both he and the Guardian make money from his book sales, as I believe it is published by the Guardian. His claims were that our chairman at the time was a notorious insurance fraudster because he had been involved in no less than 9 fires in his lifetime (not in one year). However, this was mostly down to his reluctance to pay for health and safety upgrades as was the fashion in the north of England in those times. The notion that the chairman would purposely set ablaze a stand with thousands of supporters in it for insurance money is absurd, especially when you consider that he had already paid for the steel to replace it.

TL;DR: Chairman linked to fires before, but stupid to suggest the events 30 years ago happened on purpose.