Are you the coach at this high school, dealing with the kids he/she has? How do you know the coach's advice isn't exactly what these kids need to hear to get the best high school running experience possible? What makes you think you can judge how these kids should be coached? What gives you the right to sit behind your computer screen and judge what's best?
Telling fat kids that if they want to run fast, it would help to loose weight does NOT hurt them. It's just the truth, and it will allow them to deal with reality on realities terms. Lying to them would be more harmful. Of course, this truth could be delivered to the kids in a constructive way or a potentially harmful way. The fact that this coach allegedly has a password protected blog that states this truth, does not indicated whether he/she is telling this to kids in a constructive or harmful way. Jumping to the conclusion that this coach must be doing something wrong, IS IN ITSELF the more evil and destructive thing to do. Live and let live and keep your big nose out of it.
That said, I would guess that a large number of posters here ran at the HS and/or college level, and a lot of them do have experience coaching. The high school coaches I've talked to say that the #1 barrier to them being able to do a good job coaching, are the helicopter, over-bearing parents who can't let their precious little babies deal in the real world. So all the comments here that you think are so dreadful are EXACTLY the things young people need to hear and deal with so they can grow up to be productive happy adults. The very people you think are so awful, are the exact people trying to do what is best for the kids, but you wouldn't know it, because you just want to judge.