Not the OP, but I interviewed a candidate for a remote position. He was kind of halting in his responses, until he suddenly wasn't. Borderline erudite, and I recognized some LLM speech patterns. I told my manager I thought he was using an LLM, but we hired him anyway.

After a few months on the job, he hadn't done any meaningful work. His responses to support tickets were clearly written by an LLM and offered only the most generic (and therefore unhelpful) support. He was eventually let go, and deservedly so.

For every candidate who gets accused of using an LLM and is actually using one, there are five candidates who get accused but are not actually using any LLM.

There is no substitute for an on-site round.