There are no apex seals on this design. The combustion chamber is in the little tubes on each side.........
I was looking at those “compression” and “expansion” rotary thingmebobs in their drawing. To hold compression or expansion, those would need seals, yes?
You’re talking about the MYT engine, with a donut shaped cylinder, and pistons whirling round in it.
Whether it really works God knows. Whether Angel Labs LLC is even still in business, God also knows, as the Internet has no news about them for over a year.