it falls prey to every fallacy of AI creativity research (and AI research in general), e.g., that "AI" is a monolithic technology, that "AI" is independent of human intention, that "AI"'s telos is to produce artifacts "indistinguishable" from "humans," that the ability to "replicate" certain genres of art (especially genres positioned as highly "creative," like poetry) are benchmarks along that telos, etc.
the paper really should be called "People who don't give a shit one way or another react ambivalently to output of billion-dollar machine designed by hucksters to trick people into thinking its outputs are plausible exemplars of textual artifacts in a specified genre" (the study participants were crowd-sourced online and paid less than a living wage)