I have to admit to being a member of the group before I am called out on it, but I am also a longstanding Mumsnetter (haven't just signed up for this thread).
I think the facebook post will come across as concerning to some people, however I think he has simply missed the aim of it and a lot of (unconscious imo) sexism has come through in the message. It does sound like he is trying to take all the credit and I think the problem has been is that he has given it solely from his viewpoint so it is very knight in shining armour. If Rachel had written the post and shared her story then I think it may have sounded better. Saying that, i think the members of the group will most likely support the message for the purpose in which I think it was written - to encourage and build confidence. I am not saying it reads well at all, I just don't think there was an intention for it to be so self-righteous.
Nobody knows what goes on behind closed doors, but on the face of it they come across as a strong, united, supportive couple and team trying to grow a business.
Is she really happy now that he has 'encouraged' her to diet and reveal her body online?
She is a personal trainer and 50% owner of the company so I can only assume she is happy with her role.