This is true, max manual braking + max reverse thrust provides the greatest stopping capabilities of the aircraft. If you consider the PI advisory section of the QRH for non normal operations, all figures are based on the application of max reverse thrust and max manual braking. No reference is made to autobrake settings.
PS - max manual relates to maximum application of brake pressure - no modulation. It therefore suggests that the anti skid should work in tandem with max applied braking pressure