Very clearly hybrid can mean a whole lot of things, a hybrid car is a single car with 2 engines in it both electric and petrol driven, Please don't be of the mindset that a hybrid has to mean X which you have in your mind and only X.
The Neo Geo X "Dock" is more than just a TV out cable for the console, it also allows you to use 2 USB arcade stick replicas of the original Neo Geo AES machine letting you play arcade games which support multiplayer on the big screen from the one "Handheld" while docked, so yeah that isn't a feature which you can do with the system while it's functioning as a handheld.
Another Hybrid-esque console right now would be the PSP-Go a Handheld platform but can also be wired to a TV and used with a Dualshock 3 controller, Sure it is the same console on both TV and as a Handheld... but the fact remains that it is a handheld which can be used as a home console sitting back with a controller and big screen.
There are certainly other ideas you could have in your head about what a hybrid console/handheld is, but just because there is an image in your head which isn't a handheld which can be docked and use a proper controller that doesn't mean that those systems aren't hybrid console/handhelds.
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