Oh ffs, people can't celebrate anything these days.
If you think there is a 'tone' that he thinks all women should, or could, look like his wife at 7 months pp then that is your issue, and you are looking for a tone that isn't there to justify your own insecurities.
She looks great and he's proud of her. Even if I was married to a PT, and had access to a home gym, chefs and childcare on tap, I could never achieve what she has because I don't have the motivation or desire to. I'm too lazy. She has got where she has through hard work and dedication.
If shit like this upsets you a social media break might be helpful. He doesn't have to acknowledge any privilege or put a disclaimer that not all women can or should look like this to pander to other people's feelings.