That's a pretty idiotic image. Just because the early demonstration only showed these repeated structures does not mean, you can't align objects in an angle (apart from turning the object's points in its object space). The world being tiled is a non-issue, since the tiles would contain points positioned arbitrarily in three dimensional space.
In order to claim such things to be true, you would need to show it in the engine, not make it up out of thin air. Otherwise it's just useless speculation.
But it is true though, that this interview did not bring anything what we did not already know, apart from the data compression.
