I have read a bit here on crate training...I think it depends on the size of the crate and the type of training.

If it is a larger dog cage with a doggy bed, food, water, toys - and IF the pup is trained to see it as a happy safe place, it can work very well.

It should NEVER be used for punishment.

If you are talking to this person again, you might ask what kind of crate they are thinking of, and how they crate trained their previous dogs. (If they never have had dogs, and HAVEN'T crate trained any, well, there you go!)