I think the result is going to be a product of the mail in testing used. It looks like he is going to go get better testing done. He should have Test from the batch that tested as 330mg/ml so he would have to be a very low responder which seems rather unlikely.My 175 mg a week TRT puts me at ~1000-1100.
Under 1400 for 400mg is pretty bad. Bloodwork isn't the best measure, though. Some people legitimately are low responders.