I wonder if that is LTA's interpretation of our requiring front brakes at 175 mph. Maybe they interpret that as requiring two separate systems. To that point, The Blackbird does have two independent hydraulic systems it is just that each operates pistons up front and in back. That linked system does add a bit of weight, and complexity, though so I will probably de-link them using a kit from the UK.
The rule does make a Blackbird ineligible for production class in Loring but that doesn't bother me since chasing 1350cc Busas isn't my goal.