Turbo Muin Smart B+ is not power controlled in any way. It’s called Smart because it integrate power, cadence and speed metering inside the trainer.
Turbo Muin I & II are the same without these sensors inside.
Real Turbo Muin works great on Zwift and is power controlled.
Even between original Turbo Muin serial numbers there are some differentes. I don’t remember the serial number, but if i don’t recall wrongly, from 10.000 they are harder.