Sodom and Gomorrah is a pretty stark demonstration of how God views the practice.
Personally, I don't think there are going to be any startling revelations in all this. From the excerpts in the article, it seems the reactions he got are much what I would expect. Still, maybe his book confirms that. Maybe it gives the lie to all this "its the way I was made" nonsense. After all, if no-one in the Gay community spotted he was straight it kind of proves its only an attitude of mind.
I also think it's a pretty cruel experiment, as any would be that involved lying to and causing pain worry and discomfort to your family and friends.