I noticed that too, but didn't go searching for the thread.

As I was checking details of the match between the Infocus pdf and the RCA standard signal set (from old reverse engineering results), I remembered doing exactly the same thing before with a pdf file that only hinted RCA and turned out to have each bit inverted.

I don't remember the brand of that other occassion, but Infocus seems likely. You may be right that it was even the same pdf file. I tend not to remember such things.