It was mostly a joke meant to play off the idea that avoiding a cult because it's something like superstitious is itself a superstitious action.
But since the joke didn't go over and I'm in explainer mode anyway, the kernel of truth in the joke is simply that the word cult here is obviously a tongue in cheek reference to how excited the early adopters are about the tech, and acting like it's evidence of some deeper shadiness is probably assigning more meaning to the word/phenomenon than it deserves. And changing one's behavior as though the meaning they imagine is real, well... there's a word for that ;)
It tells you something about how Roam Research marketing people view their power users. I think I'd avoid it for the same reason.