Got any proof? I say it's a false rumour. I've read it too and version I've read said that texts like "GAME A" "AM" "PM" were disabled because they'd show up mirrored otherwise. But that's not right, as a matter of fact, the first couple of G&W simply didn't have these text segments.
Also, the digits are slanted to the right as expected (if it was mirrored, they'd be slanted to the left). Plus, they are lined up as "18:88"