According to that, I could cross my Shire mare, with an appy-colored Gypsy Vanner, and register it as a Sugarbrush draft??? That foal would be a Drum horse by type and breed, it wouldn't look anything like "O" or the basic idea I see of SBDH horses... .
Your shire mare X Gypsy makes a Drum your right, not a Sugarbush.
But bred your Shire mare X Sugarbush you get a sugarbush.
And your foal would be labeled accordingly to the registry
Like premium would be 100% sugarbush
Your foal would be below that level & not full blooded SBDH.