not necc scoffing as who the heck knows and I'm guessing most builders have more experience than me so I'll assume I know nothing.
I think in that article he was saying that the heel end of the neck joint should actually touch the body... and that would be the source of tone transfer. wait, what? I could see making the point that more contact would increase the coupling, but why specifically would neck end grain contact improve anything? Perhaps he just meant a continuous piece would increase tone transfer. So now I would think it'd be better to cut a 45degree angle on the butt end and really couple them? I find it hard to believe but I would honestly love to know.
prs: why in the world would an exposed neck heel increase tone?
my mouth, which is connected to my neck, often has an exposed foot... which is connected (in theory) to a heel... ok, yeah I can see that now.