Add me to the crowd that believes the should have shown at least a little bit of the non-motion control options, even saying this as someone who spent most of my time in the Testpunch using motion. The game is plenty playable and fun either way, and you can still appeal to the people who enjoy motion controls while also subtly making the point that people don't have to use them if they don't suit you. I'm fairly certain there are folks out there who might be interested in how the game looks, but have no interest in "waggle boxing, like what I played on the Wii ten years ago," and anybody not following developer interviews and such closely may not even realize that traditional controls are even an option.
Like has been said by others in here, one of the big cool things about the Switch is its inclusiveness in playing where and how you want to, and this ad doesn't fully reflect that. I'm assuming this won't be the only ARMS commercial to come around but I won't be surprised if none of the others have any mention of button controls either. It feels like Nintendo's been almost intentionally hiding that knowledge from the public eye.