That's a good point. Could be that the developers have missed it in a beta version (or, obviously, it's fake).
But I'd also like to note that the gameplay footage, like the cutscenes, has the traditional trailer frame around them. That is, those little square mirrors which enlarge what's going on.
The only way this is possible, if it is fake, is through two possibilities:
1. They used gameplay footage from an old trailer and put English commands over the old ones.
2. They actually took the time to make this frame.
Option 1 is easily provable/disprovable. Just check the trailers. I looked through a couple and there is no gameplay that matches the ones we see here, though you might want to dig through some more.
Option 2... I guess it's possible. Taking the time to make that frame identical to the one in the trailers. Frankly, though, that sounds like too much effort.
If this is fake, too much was put into it. I would feel bad for the person who put this together, because the only person they seemingly trolled would be myself (and the op).