Because he hasn't built one and hasn't a clue, would be my guess
. "This engine will operate only at full throttle to demonstrate the torque and horsepower of the 6" engine. The depicted engine 
(with two (2) compression pistons) is expected to efficiently produce 4 Hp at 2500 RPM. The six (6) power piston version 
with 36 compression pistons will then be expected to produce about 288 horsepower at 10,000 RPM and about 576 horsepower at 20,000 RPM."
Why not check the link I gave and see if you can find the answers rather than guess whether or not he has a clue?