NIKKOr 200-400mm f/4G eD Vr II Autofocus Issue?

I'm considering buying this lens, and will be trying one next week from my local store. However, here's the rub, I would like the ability to use my TC-17EⅡor TC-20EⅢwhich the Nikon website says is compatible, but it also states that autofocus is only possible on the s TC-14E/TC-14EⅡ.
The actual quote is: AF-I/AF-S Teleconverters TC-14E/TC-14EⅡ/TC-17EⅡ**/TC-20E**/TC-20EⅡ**/TC-20EⅢ** are usable. (**Autofocus is not possible.)
Am I being dense as even with the 2x converter you'd only be up to f8 which both my D800e and D4 can cope with or am I missing something here?

Can't say for sure but I think at f8, the center cross AF point can only AF with the TC. I would bring both TCs to the store once you get there and ask the sales clerk if you can try the lens with your tc using both cameras.

The TC-20E yadda yadda was announced in 2009... and that's when the specs were written... The D800 was announced in 2012... see where I'm going here??? Nikon's not real good at going back and updating the spec's for stuff...