Does accessibility technology do anything at all with <article>? I'd be very surprised if it did.
<section> once drove the model where we were going to kind of soft-kill the h1-h6 elements and have only h1s where their heading level depended on the section nesting level... but my understanding is that this didn't really work out and is functionally dead, and the current recommendations are all to just use the range of numbered headings as before.