I don't know a lot about his recent care but when we went to go see him he got hardly any grain and the owner put hay in his stall while we were there and he acted like he hadn't eaten for a while.
Grain is not "normal" horse food; eons of evolution designed them to eat grass, not grain. Though an awful lot of horse people feed it in one form or another, grain can cause all manner of problems, and it should never be a major part of a horse's diet. The majority of what a horse gets to eat should be forage (hay or grass); like @Kusanar said, most "easy keepers" get by just fine on no grain at all. Some "easy keepers" can't even be allowed free access to grass because they will get too fat.
As for the horse's eagerness for his hay - show me a horse that won't tuck in immediately when you put food in front of him, and I'll show you a seriously ill animal. Every time I have started to feed hay at any barn where I've done it, all the horses that can see me start yelling like they are famished, even if they still have leftovers from the last feeding. While it is possible that the owner hasn't been feeding the animal properly, you can't assume that the horse is being starved simply because it acted hungry.
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