Well, first of all, he's blaming game writers. In an ideal world, games wouldn't have stories tacked on to them. The industry currently works with writers usually being hired later in the project and having to make sense of what has currently been made gameplay and graphics wise. Heck, God of War didn't have a definite main character until very close to completion. So you can't blame game writers for being assigned to "space marine game #243" or "world war 2 game #132". You blame publishers. Oh, but I guess he's too scared to blame publishers because he'll never know when he might need their funding?
Second:
This is one of the most juvenile writing advices you can give. It would mean that no one should ever write about a character committing suicide until we figure out how resurrection works. We shouldn't even be writing about death until we've died once! There's a reason "Death of the Author" exists as a concept. What or who you are shouldn't have an impact or be referenced when writing something or discussing a written work.
Heavy Rain was a good game, but that doesn't mean the author isn't talking ego-tripping bullshit.
EDIT: I'll take my second remark a bit further and would like to ask whether Mr Cage has done the following (Heavy Rain spoilers incoming)