They probably detect this. Thats why the problem is solved after one to ten minutes according to the article. There's probably nothing they can do which wouldn't stress the disks more.
> In our experience, the documentation is accurate: sometimes volumes pass in and out of their provisioned performance in small time windows:
What AWS consider "small degradation" is sometimes "100% down" for their users though, look at any previous "AWS is down/having problems" HN comment threads and you'll see there tends to be a huge mismatch between what AWS considers "not working" and what users of AWS considers "not working".
Doesn't surprise me people want better tooling than what AWS themselves offer.