I think the test was vibe coded, because a xylologist is someone who studies wood, not someone who sells wood. I am not sure if "xylolgist" was the exact word, though.
xylo- = wood; -logy = study
Indeed from M-W: "a branch of dendrology dealing with the gross and the minute structure of wood"
Seems to be a hapax legomenon https://www.oed.com/dictionary/xylopolist_n "OED's only evidence for xylopolist is from 1656, in the writing of Thomas Blount, antiquary and lexicographer."
That test had several hapax legomena on it, so it would make sense.