Wish I knew. I found that pdf on a website some 10 years ago, and can't remember where I found it.
That's one of the big problems with the internet ... no guarantee it is what if says it is.
It is also possible the data for the early F4Us is correct and it was updated a couple of years later, but I can't really say. It's just a pdf I had and threw in here. There are more somehwat like that one, but relatively few with such glaring "out of time" characteristics.