theory: satoshi tajiri was killed. that's why he never appears, his image nowadays is fully unknown, he lives in the shadows yet they keep crediting him in every game's credits as executive producer.
there's no recent pictures or videos of him, and those claimed to be recent are very weird and he looks young. He was killed for some secret plan in gamefreak's but they can't let the public know, hence they claim he's still there and alive. even his biography references nothing of his current self.
It's not true that he's an autist and neither that he didn't like to show himself in public when he took a lot of interviews at the times of red and blue. there's something cheesier about this story