While technically true, one could argue that because they described sliding a mirror underneath the table, that they did this in order to be able to see from that particular angle, so the implication for any reasonable answer would be that are looking down at the table.

The way the question is phrased, I'm definitely in the "ok, what's the trick, what do you want to hear" mode. I'm not surprised LLMs answer in a weird way with extra details like "this is how mirrors work, is this what you're confused about?"