What tires are you going to use? That spec was predicated on 650b x 42mm slicks and 54mm knobbies
A slacker seat tube should always mean the physical top tube gets longer to keep the wheels in the same place, it'd be very silly to make the actual bike shorter just to preserve a virtual measurement
It's pretty hard to get TCO on a low-trail bike, you'd have to be quite short and be using very big tires
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