I mean, you can dismiss me by calling me a cynical curmudgeon (which is not inaccurate), but from my perspective their website doesn't try to convince -- it tries to bamboozle. I don't think it's idiosyncratic at all to expect that claims made should be proven and supported, and that companies should present themselves with integrity and be genuine in their representations.
> Curmudgeons and cynics can't be convinced in the first place so it's not a good idea for a founder to put too much time into indulging them.
I'd say we're just not convinced by marketing lingo and puffery. I was convinced by the simple README containing code and transparent evidence that a fellow HNer put up in their personal capacity, so maybe you can direct the Nia team to that as an example of how to properly convince curmudgeons and cynics.
Kudos to you for "which is not inaccurate" and the subtle shift to "we" - that made me smile.
Personally my tastes are much the same as yours, but we're asking for too much if we want startups to stop doing normal marketing.