You said he already worked for a month and this was a probational review.
In all honesty during a probation period there is nothing you can do when you get fired, hence why they call it probation to give employers a get out of jail free card on dropping people. Asking generic questions is probably just a formality they go through then say no, irrespective of the answers as they already made up their mind they don't want that person to continue.
On the flip side, who knows what your friend talked about with someone in the office prior the review interview. He could have rubbed someone the wrong way (maybe a female employee) or he was too strong in his opinions during regular discussions and was reported and the interviewer basically wanted to confirm whether he would dodge the question with a political answer neutral.
