Looks like with the most recent update, the "game speed" functionality isn't working as intended. The 16x speedup is more like a 1.4x speed up, while in the last version of the trailer it truly was 16x (and still works)
This is a common problem in unity games and it happens when developer decides to use a different method for the games speed and in such a case the only solution would be locating that method but it might take sometime or might be too complex,i'll look into it but no promise.