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I think that's saying that you can't run the dynamo lights off the 5VDC output from the D1. If you look in the manual it says
Where you are running dynamo lights, you can 'piggyback' off your
current wiring, but don't connect the D1 to a regulator – it should
get it's power direct from the dynamo. Research the specification for
your current lights to see how they regulate the extra dynamo power.
Most 'dump' anything over 6V as heat, but the D1 uses this extra
capacity to provide greater output at higher speeds.
"The D1 gives out 5V DC and shouldn't be used with dynamo lights. " :/