Ah, interesting. Thank you for challenging my assertion.

Upon deeper introspection, my own personal experience of “happiness without meaning” is closer to “the meaning is just the universe/physics unfolding (and I happen to be a part of that)”, which is so all-encompassing that it has little meaning itself, in the Kolmogorov complexity sense. And concomitant well-being, which I would define as closer to “completely neutral affective experience” rather than the “positive affective experience” described as hedonic well-being in the study you referenced.