Trying to tell customers "Oh this device by our competitor sucks because you can't install all of the apps you like on it, here - have this device that we make that sucks because you can't install any of the apps you like on it" is kinda stupid.
Hell - you can't even install Google Chrome on a Surface. Or Photoshop and Illustrator for that matter (which is a no-sale for one of their earlier extras-pretending-to-be-a-real-person earlier in the ad).
You didn't watch the ad. They didn't compare the Chromebook to a Surface. After all, those devices aren't in the same price point. They compared it to an Asus T100, on which you can install Google Chrome, Photoshop and Illustrator.
That said, "given a choice between a Chromebook and an RT", I think most people would pick the RT.