This is one of the most out-there 'voodoo' grow techniques yet. I haven't heard of it, but there are reasons why it could potentially work- IF it worked, I would say that the amount of available sugars provided by the corn would help the pot put on mass, but I tend to look with skepticism on a claim that they will 'grow together'. Hm.

Someone got a cornfield to test this in?

I'd grow pot with clover or another N-fixing cover crop myself...