I guess that’s the risk of this non-leetcode kind of technical interview. I loathe leetcode interviews and really enjoy doing these kinds because I usually think it lets me highlight some of the softer skills (clear documentation, onboarding instructions, and other bits that would make it easier for a junior to join my team). But wow I guess this is the flip side where the reviewer is clueless.
At the very least this tells me if I continue to administer these kinds of technical interviews I will leave room for a back-and-forth with the interviewee and give an opportunity for an update.