OT: since the OP doesn’t use NP, this won’t matter in terms of the question, but since you stated:
Here’s a pertinent demo of NP jazz playback done by @fredgunn:
I can only reply that in my work using NP, if I don’t manually adjust some played durations (for things likeshort quarters and “phat” marcato quarters) and add slurs and accents that are normally omitted from jazz scores/parts for being seen as unnecessary clutter (given swung playing stylistic assumptions), then the playback results are execrable. If I do, they’re not.
My understanding is that NP does, in fact, do under-the-hood “interpretive ‘humanization’” of rhythm, and it’s “classically” oriented. Do I understand incorrectly?