They're not very common, but they're similar to other LG modules. Passive cooling. Connector is weird, I ended up just buying those wire harnesses by never got to tracing them - I never opened the cover, so still no idea what the pinout is like - certainly for 16s there are way too many pins, so must be lots of thermistors all over the module.
I think he was referring to the controversy where LG took legal action against sellers of these modules.