I get what IRF is saying, and I am going to give the benefit of the doubt, too, and say that I don't think it was meant to be antagonistic - probably more of a disclaimer to explain that not every Jewish person you meet (from whatever background) will necessarily believe it important to their faith to follow these or, indeed, any other forms of observance Just as with any faith, I believe.
If it was a disclaimer, it was probably a little redundant, as Yael has already mentioned that observances vary from group to group.
Thanks, Yael