If the text in your alt text is the same as the text in your post, that is functionally not alt text. The people who can only access the text of your post will get the same text twice.
If the text in your alt text is the same as the text in your post, that is functionally not alt text. The people who can only access the text of your post will get the same text twice.
(Which is to say that I, a sighted person, have just encountered one too many of these posts, and if it’s driving me up the wall when I can actually see the image, I can’t imagine how frustrating it must be for people with screen readers.)