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."