This is utter nonsense in my opinion, another useless "definition" of a disorder that will be used to stigmatize and ostracize people based on their preferred hobby. Now I'm not saying some people don't have a problem with gaming way too much, but that's usually a response to another actual problem than the root cause being "addicted to gaming."
I have to agree with testnotch addiction can be with literally anything and in large quantities can be unhealthy, but its ultimately up to the individual to decide where their time an effort goes.