He didn't say RMXP games, Dio, he said games. And yes, most of them are made by a team. Even RMXP games often use graphics created by other people, or at least the RTP. That could be called a team
Besides, lethal yarn isn't making a story heavy game. The story seems about as important to his game as (what I've heard) stories in porn. When I help someone, I usually just ask them questions about things, and occasionally offer a few possible routes to go in creating the basic situation. Besides, even if the concept and characters were made for you, you have to WRITE the story. Like fanfiction. It's not a good concept that makes a story, it's good writing and presentation. A BAD concept will hurt it, but I've read plenty of stories with amazingly awesome and epic premises with great characters. But it fell through on the actual writing.
So to sum it up: who cares