>I sent him a link to Mouser, a catalog where you can buy a 0.006 x 0.003 inch coupler. Turns out that’s the exact coupler in all the images in the story.
I did a super quick search, and sure enough, yep- the images in the article are most likely a $0.38/each 0603 coupler.
https://www.mouser.com/ProductDetail/TDK/HHM2510B1?qs=sGAEpi...
I'd imagine it's mostly for illustrative purposes, but Gell-Mann Amnesia Effect in full force here.