We'll have to agree to disagree.
I'd love to believe that he's done very well and just wants to see others succeed. Perhaps sometimes that's actually true but if it was his credentials would be obvious, rather than 'ran a multimillion pound marketing business' - for all we know it ran at a loss and we can't actually even check - marketers are not exactly known for their brutal honesty in sales materials
Anyone can pronounce themselves an expert, get some testimonials, write some articles and speak at a conference or two. From my very limited research this appears to be what he's done and what he's telling people to do.
I've seen people do it in more than one industry while I know for a fact that they are poor performers. SEO is notorious for it - the best SEOs really don't need to build a profile or earn money from speaking and writing about it.
Anyway, if you get something out of it good luck to you, I agree, each to their own.