I disagree entirely OP.
On the broader point about sharing personal information about children, I agree - I don't do it myself, and now my DC are of an age where they can say if they are happy for me to share a photo or not (mostly not).
However, in relation to your specific OP, I think you're clearly making a judgment about her - I am not a fan at all, and agree that most things she does are about monetising her brand.
Potentially she is doing this with her DS and his diagnosis, and if so, I'd have a negative view of it.
However, on the face of your OP, sharing details of a condition her DS has, as with any other condition, is not problematic in itself. If, for example, she starts giving specific details about challenges he may face, or reveals information from medical appointments, that's entirely different. For many different reasons, people in the public eye, may choose to share at least the information that their DC has a certain condition. This can be done without exploiting the DC.
I haven't seen any of her posts, don't follow her so am only going on your post, and I think on that basis YABU