Maybe I'm reading it wrong, but doesn't really state anything about tyre width v wheel width. All I'm getting from it, is if tyres on the same axle are different, they'll fail.
On the E39 both tyres were 225 when I was told they were the wrong size. Had they been brand new I'd have queried it, but just had them changed.
Ross, more research on wheel-size.com does support your thoughts on the fitment of 225s on 8j as standard from factory.