(This assumes that the guy passed through the resume filters and advanced to the in-person stage, which is not that easy. Should work on a video call though.)

Still has to respond "no" on the post interview scorecard because the given solution didn't use the optimal ObscureLeetCodeAlgorithm

I mean, the candidate can design and build innovative custom hardware, but do they remember an obscure impractical algorithm from a second semester CS course? No? Obviously not a fit for this company.