This post IMO (and others per the votes/comments and a flag) should not be an answer:
It's a cool comment that can be posted as such by linking to one of the dozen web articles on that story.
What do you think?
Example comment I agree with:
The ground speed anecdote is irrelevant to the question about maximum ATC flight level, and the descend FL600 anecdote only shows that one aircraft once had to ask for it, but doesn't help anything about whether that was within their control. This does not answer the question at all.