Yep, I see it's just a range extender. That is a use type that the rotary loves. Steady high HP output. Good in aircraft too.
If they blow a tip seal, they often just keep going until shut off after landing.
Maybe they have been able to get emissions down under those conditions.
Maybe they even did a peripheral port design like we used to do back at the VRI in the 1980's, which doubles the HP output. Add a high boost turbo, doubles again. The actual rotary for this application could be tiny if they did all of that. Also make it a ceramic liner and rotor, and wow. So ceramics could work.
The smaller the rotary engine the less wear on the tips, but leakage is higher by percentage.
I don't know the chemistry of ceramics for internal combustion, but it's in racing all the time.