It's quite insensitive to throw that accusation around based on how he looks (rather than his behaviour) when so many people are battling this disease at the moment. Chris has worked hard to go from 150kg, down to his bottom weight of 79.4kg. Even at that weight he was still within the healthy range for his height but as the show is finished, he's already weighing 85kg which gives him a BMI of 22. He plans on sitting around 95kg-100kg.
Here I'll answer a few of the main points I've seen on other forums:
Too Skinny: As I've just mentioned he's well inside the healthy range for his height. It stands out a little more for him because he is so tall (6'5") and therefore has long limbs. People were even saying he looked anorexic when he was 100kg! His face would've added to this 'too skinny' look because the contestants dehydrate before each weigh in.
No Strength: This is based on Bob's statement during 1 episode when Chris was struggling with 7kg dumbells. What Bob didn't mention was that Chris had been training for 2 hours before that bit was filmed. Chris has not done much weight training before so no matter how much lifting he did in the house he was never going to come out strong. He currently bench presses ~50kg, which isn't what I'd class as week.
Not Eating Enough: He went through a stage in the house where he was dropping his calories and from that point on everything bad that happened to him was blamed on this. When he left the house he was eating 1100-1600 calories per day.
Since Chris left the house he has had weekly medical checks, diet analysis, blood tests, and psychological evaluations. It would be highly unlikely that he would be able to pass all those tests if he was unhealthy in any way.
My new book:
Winners Do What Losers Don't