A very intelligent person can simultaneously be very stupid, and stupid behavior can be increased with tight deadlines or a high workload.
If he thinks it is like querying a database and had never heard of hallucinations then this could just be an honest mistake. Especially if he thinks AI would be smarter than a database.
My first thought that he was a mess in general but we really don't have enough information. Like the other guy saying he cheated in life, it is pretty absurd to infer that.