I call it plausible since small rotary compressors really do exist.
The efficiency, specwise, is going to be relatively poor due to the challenges of making a small compressor efficient and because it uses a cap tube due to the difficulties of making a low capacity expansion valve. But when only a small area needs to be cooled, the overall efficiency is going to be excellent since cooling a whole room is very inefficient when only a small part of it actually needs cooling.
I find it interesting that it specs operating temperature down to 14F as if it's supposed to double as a heater, which is technically true, but they don't advertise it. All it takes to officially support it is a second temperature sensor to measure the condenser outlet temperature and a bit of software to switch to regulating that temperature.