12mm on 1.5x sensor: f/8 at 5 feet = 2.13' to infinity focus
18mm on 35mm sensor: f/8 at 5 feet = 2.59' to 71.3' focus
Yet the angles of view are equivalent.
Note that he's talking about focusing at 5 feet, NOT the minimum focusing distance.
So you DO get more DOF using the smaller sensor and wider lens.
FWIW, Thom usually gets pre-release samples from Nikon and Fuji to evaluate for those companies before the products are released - so I bet he has this DX lens. He was the first one to point out that TTL works on the Fuji and not on the Nikon.