That's fine for Brooks, but the OP is entirely correct that people still routinely cite the "no silver bullet" doctrine 3 decades later. So it's still worth revisiting even if it's technically 2 decades past its expiration date.
The author of this post conflates better with a 10x improvement from a few anecdotal experiences that are themselves extremely accidental to the act of creating software. He may have a point about the large volume of accidental improvement areas remaining but I think this is because like the JS ecosystem they are growing faster than we solve them.
I think the reality is likely the author is themselves a 10x improvement over their decade-past self.
Do you have a link to this? I'd like to read it.
Here's [1] a link to his 1995 update, an excerpt from an anniversary edition of 'The Mythical Man Month'