From the internet:
Rewrite: write (something) again so as to alter or improve it.
So any time we are changing words, deleting words or adding words - we're rewriting, regardless of our personal processes.
The average newbie cannot pull off the Lee Child process, or the DWS process - one pass and done. This is terrible advice because the newbie will almost certainly fail, and then assume they suck because
'all the cool kids are doing it'. This is not supportive or helpful. And, by the way, most of the cool kids aren't doing it, see quotes up-thread.
Also, point of fact, shallow stories require way less rewriting. But if one wants to go deeper, additional reworking, (beyond line edits), is probably going to be necessary - because we're exploring an idea, that is, we're not just spewing our opinion all over the page. The act of writing IS the act of exploration, and exploration is often messy. We have to find our truth in the text. That requires work, self-reflection and lots of rewriting - at least for newbies.
New writers should plan on extensive rewriting - that's how they get better. (And I'm not talking about years, we get better by writing new books too. It's a balance.)
On the other hand, seasoned pros already have a process and they don't really need the advice in the first place.