I'd say it's not such a great place if he's been there and looks like that. Sorry.
I wouldn't ask how much and what they're feeding him, I'd OBSERVE like does he have hay available at all times, and what quality hay. Is he by himself, or stalled, or lives in a herd. Does he get any other feed apart from hay. If so, how much. Don't ask, weigh it yourself.
How old is he, when was he dewormed last, did he have his teeth checked?
You posted such a nice pic of you and him( love the kitty and the other " decorations"), but it would be so much nicer if he was round and shiny.