This is a good rule, and I think the first test of it is "have you suffered through proof-reading it three times?"
The garbage people write when they don't even proof-read it themselves! I find that by the third time I read through my writing (ideally spaced out over a few days) I have worked out most of its kinks.
And read it out loud! If you cannot, at least get an AI voice actor to read it for you. You catch so many more problems that way.
Definitely agree.
I initially included this in the article but I took it out because I wanted to limit to just advice I didn't see covered much elsewhere, but I always tell people to read their writing aloud.
I don't think an AI voice would get most of the benefits, though. For me, a lot of what I notice when I read my writing aloud is that I find myself naturally finishing sentences in a way that departs from what's on the page. And however I finished the sentence naturally almost always is a better rewrite than what was originally there.
Instead what I do is glance over things - but that mostly means I fix anything my spell checker has flagged. I know from experience that if less than several hours haven't passed I will not see all the things that don't make sense - they make sense in my mind and I know what I meant really meant. Several hours/days later I will see just how impossible things are to understand. (I'm now going to press that reply button, I hope this all makes sense to you..)