Well, at least it looks like a brace.
Seriously, however, I have encountered screeners who have no idea what the various items are, and insist that they must be removed. Some of mine may look more decorative, but they are indeed medically required, and fall into that category.
Some screeners obviously realise this without being told, but others seem to fail to understand they are medical devices, and others seem to think that they should be removed.
Again, there is the 'factual' information on the TSA website, and the actual experiences of passengers, which sometimes differ. There really is no guarantee, no matter what the website, or other posters, or TSOs who post here tell you.
The only thing which matters is your own experience at the checkpoint, and for that there are no guarantees.
I cannot determine your gender from your last page of recent posts, but again I recommend a skirt/kilt, at least at the checkpoint.