Is Pickup mod needed?

[neverwas]

I have a GPR1-M kit, which is in the Languedoc style, and intend to use Tonerider AC2 with nickel covers.
For the wiring, have this schematic from 1728.org (their site is not working so cannot link directly, can only show a scan of the page)

The note at the top states:
"This can only be done with a guitar whose pickup covers are not permanently connected to the ground and the minus output and both pickups must have four conductor wiring".

I am going by the DiMarzio colours and I think the black from the neck pickup is the minus mentioned. Have separated the black and white wire link and tested conductivity to baseplate and cover, no connection to black wire, only bare as expected. May have answered my own question but would like someone else to have a glance. Any input would be helpful.
Have started the wiring, from the schematic the switches are rotated 90 degrees anti-clockwise for how they will fit in the guitar.

Thanks
Grant