I do not believe this adapter will work for your application. The bi-directional function is referring to being able to pass digital information back to the source as needed for digital cable TV applications. Cable wiring from a cable company passes all kinds of digital information both ways because it also includes Ethernet information.
To use two or more signal sources for one TV (or other display appliance), you would need either a video A-B or A-B-C selector switch or a component stereo system (that would decode surround sound for a home theater system) with selectable inputs.

I know this question is 10 months old, but for those who might need this answered. I had this in my setup with a TiVo Bolt using MoCa to a Mini. I had tons of signal loss and drop, even after installing a PoE filter. I changed this out for a standard MoCa supportive splitter and so far so good. So...in my tests, no this does not support MoCa