If you search "Breath of the Wild" on Amazon you'll be presented with 3 results right at the top. One of them is a sold out Special Edition. The other two are very clearly titled, pictured, and even categorized for Switch and Wii U.
I'm guessing everyone contacting CS telling them the Switch version is the Wii U version got someone working at Amazon confused enough to change the title of the Switch version to say Wii U because nobody seems to realize that there is simply no other product page on the website that could possibly be the Standard Edition of BotW for Switch, and there's no reason to have two Wii U version pages with Switch art on one of them.
tldr; Order that one. If you have it ordered keep it. I will be amazed if anyone ordering that version ends up with a Wii U copy instead.