Like Nintendo Everything wrote:

"Some folks have been expressing concern about Zelda: Breath of the Wild’s frame rate on Switch’s handheld unit after seeing the video last week. This is important to point out, as it’s now widely known that what we were seeing isn’t true footage from the main device."

http://nintendoeverything.com/switch-trailer-gameplay-wasnt-from-the-device-nintendo-says-dont-assume-the-video-shows-actual-game-footage/

Yes Nintendo, we shouldn't assume the games that are being played on your console reveal are actual games. Our bad. We should have known better

This just proves my point that Nintendo's messaging is still bad and their communication has a lot of issues.

I woudn't be surprised if that's the case for what they showed.

I find it a bit hilarious that it seems so far fetched to you that Nintnedo might have been a little "optimistic" in its marketing. It has used PS3 and X360 gameplay footage in previous commericals. Why does it seem so unreasonable that Nintendo might have done something similar again, except maybe for a game that isn't even in development. Have you considered that perhaps Nintendo included Skyrim in their ad as a way of trying to force Bethesda's hand to make the game? If Nintendo's NDA's are so taught that 2K Sports and Bethesda can't even announced games that were shown in the announcement video of a console to a point where people have legitimate concerns over whether those games are actually coming to those platforms, then Nintendo has dropped the ball. You need to come to terms with that.

Besides, the word "support" is a pretty vague wording. It could quite literally mean Nintendo asked for Bethesda's input when developing the NS, and Bethesda did so. In no way did their statement concretely say they were bringing games to the NS at all, much less Skyrim, much less the HD remaster. Any interpretation that says otherwise is "extremely optimistic" as mods here would undoubtedly prefer me to say.

One of the actors gamexplain interviewed said that when they were using the Switch, the game wasn't running on the screen. They just edited it in.

This is kind of written in the final of the teaser.While this could mean anything, I think it is more in the sense that the gameplay footage that showed in the trailer itself could not come to the game(not the game itself), or rather the bad fps will be better

This is rapidly becoming a cock up.

Great communication Nint *clap*

Hmm? Nothing surprising.

Everybody does this prior to actual product release. Things are subject to change. Nobody should be surprised by this.

Easy. Bethesda would have sued them. Your scenario implies that Nintendo showed it without Bethesda's permission, therefore Bethesda would have a valid point to sue them.