The Kentner story is bollocks.
The author "heard" it, yeah? Well, where? - Even under the very restrictive US copyright law, nominative fair use is generally permitted.
https://en.wikipedia.org/wiki/Nominative_useNow, as with other projects, like "The Great Kingdom" documentary, a few years back, he might have to plan the payment of a legal counselor into his budget for the project; if he is unwilling, or unable to do that, then, yes, posturing and scare stories, by whomever spouts them, will surely be enough to intimidate him.
But the story itself, likely complete nonsense. I don't play that card often, but I work in a field where I have to deal with stuff like that quite frequently; not so much because this was a business reality, but because many of my clients believe in this kind of urban myths. And I've said this a couple of times when we here were more involved with Kentner's efforts: I don't know who counsels Kentner at the moment, but he needs way, way more professional support than the people that he seems to have around him right now.