GPTZero -> We are uncertain about this document. If we had to classify it, it would be considered ai generated 64%
ZeroGPT -> Your Text is Likely Human written, may include parts generated by AI/GPT 34.48%
CopyLeaks -> AI Content Detected

It is possible that he partially uses AI or that he rewrites and adds words/sentences to confuse the detectors. In any case, I would not hire him because it looks very bad, regardless of whether it is a human work or some combination.