If fake screenshots, repetitious turbo-verbosity that turns every paragraph into a brain-breaking dadaist poem, and superfluous jargon-dropping doesn't convince you, what will?!

I thought the same thing - especially with those screenshots. Inti De Ceukelaire did present at Speakers and was part of Bug Bounty Village. If he was paid 50k as claimed, I imagine he demonstrated these techniques as described. The decision to present them in such a generic way, rather than obfuscate the actual testing is an interesting choice.