I think what makes the boast true, is that to fix issues like that you typically only ever need to remove features and mechanics - never add them? For example you can completely cut each piece of the game that supports supernatural elements all together and use it to run an entirely mundane noir mystery. Like, literally just cut the last chapter and ignore the blacked out skill.
So I think an issue as small as how the supernatural investigators are framed would be a pretty easy fix.
Viewing post in Eureka: Investigative Urban Fantasy Beta Oct. 17th comments
My read is that "you're a team of edgy low-rent superheroes working for the MIB" is a fundamentally different proposition from "you're the serious urban fantasy equivalent of a PARANOIA troubleshooter team, i.e. entirely composed of the exact groups you're meant to be hunting, and very keen on not letting each other know about this". Not a minor aspect of the game at all.
Relatedly, I'm... pretty sure kaiju TRPGs exist, like ones where you play Godzilla and Mothra and so on, and I'm pretty sure Earth-based adventures for those would take some significant homebrew to make even vaguely compatible. If they don't, that just raises further questions!
Well it has to be INVESTIGATIVE at the very least - I don't think Gozilla and Mothra typically solve mysteries. (Though I'll admit, I'm not super informed of Kaiju lore.)
But yeah, I suppose it's true that it might not mesh well with a module that assumes you're playing a power fantasy game. But I suppose when they wrote that line they were more thinking of stuff that came before, your call of cthulu mysteries or even generic mystery modules.
EDIT: Wait, I was basing this conversation off of what it says about using other Modules in the BOOK ITSELF. I see now you're responding to the line above in the itch post. I agree the wording might need modification.