The rule has always applied off-road: If you drive with less air pressure, the performance gets better and better... but at the same time the risk of a breakthrough increases. The limit value was so far with corca 1.5 bar, under it one can hardly dare to drive normal MTB tires.
With the Schwalbe Procore other rules apply: You can spread the air pressure in the tyre over two chambers. The air pressure in the outer chamber is extremely low - optimal for maximum off-road performance. High air pressure prevails in the inner chamber, directly on the rim and even maximum loads cannot penetrate to the edge of the rim. At the same time, the internal high-pressure system secures the tyre on the rim. "Burping", the dreaded loss of air at low pressure in conventional tubeless systems, is excluded.