Link to the post in question, that makes it easier for us to follow. Without having read his particular post, it looks like his idea is very similar to Post 379214 (https://www.thevespiary.org/talk/index.php?topic=11473.msg37921400#msg37921400)
(fallen_Angel: "P2P - new idea.", Novel Discourse)
When comparing RatHead's idea with that of fallen_angel, I thought you were interested in the general reaction sequence:
Acetylene -> Metal Acetylide -> Phenylpropyne -> P2P
...and not organocopper couplings in general. To better provide you with what you probably are looking for, I scanned the first chapter of one of my books for you (ISBN 0-89874-853-4), hopefully it will answer your questions, and if not - check out the bibliography section on page 8 and 9.
An Introduction to Synthesis Using Organocopper Reagents
Gary H. Posner
Chapter 1 - Introduction (https://www.thevespiary.org/rhodium/Rhodium/pdf/organocopper.pdf)
(https://www.thevespiary.org/rhodium/Rhodium/pdf/organocopper.pdf)