Having reconsidered my position, not to say I was belittling anything he'd done, he may have lost a fair old bit of water weight early on, particularly if he had cut back his salt intake quite a bit because of his new choices, which I neglected to think about in my comments.
I made a mistake before, when I said aroud 7.3lbs lost a week, it was probably more like 6.3, but if you factor in as much as 10lbs of water weight, then the rest of the weight would be 65lbs in 12 weeks, which is roughly 5.3lbs a week of other weight.
Whether he may have a little leftover lose skin around the core I don't know, but his weight loss doesn't look as slightly concerning as I first thought.
However eating less than 2,000 calories when you're training for what he trained for, still might have cost him a bit of muscle and possibly not provided him with as much macronutrient intake as perhaps should be, as things like cholesterol levels, heart health, bone density etc, are not visable in his results, so how good they are relative to his diet changes, we cannot know, unless he published medical reports on his blog which he appeared not to do.
I would still stand by my decision to say, he would have been a little wiser eating another 500 calories a day at least, because even if it meant taking a few more weeks to lose the weight, he'd get more macros and just give himself potentially a little bit more overall health.
He is certainly an inspiring person though and should be thoroughly commended for his actions