My take on this is that the advertisement was written by someone who knew very little about the sim, it's history and the future of the current sim as we know it. All you have to do is look at the poor screenshots and know this isn't anything new, as a matter of fact those are so bad they look more like FS9 shots than FSX anyway. Very misinformed and I think the FSX 11 was simply a mistake on his part because he didn't know enough to even check.
If you read the comments, none of them are complaining about the fact that it isn't a new sim, they're talking about problems related to the differences between FS9 and FSX and most of the comments are over a year old anyway.
Not a scam, or even trying to be. . .just a very poorly done advertisement.