However, going back and looking at the first link, something to that effect is stated. My mistake in that regard. However, even in that first link he doesn't say he hasn't gotten permission to do it since deciding to go through with the project on his own, just when he did originally pitch it (under the context of them producing it) he never heard back from them.
So yeah, you are still assuming. Unless you care to link to a post where he says "I don't have permission to do this."
Imagine this: "Hey MOM, can I borrow your car?
"Sounds like permission to me!"
What do you think will happen when the car is brought home?