If that's true it at least means Zelda will release on that date.
EDIT: It still says 4 March 2017 when scrolling down to the "Discover other amiibo" section. Might need to refresh a couple times since it shown four randoms.
EDIT 2: Yeah. Refreshing the page and every time one of the BotW-amiibos show up at the bottom it says 4 March. This is the Nintendo Europe website, so it can't be anything other than legit unless they made the same typo several times. Breath of the Wild will release March 4, if they won't delay it further. What we don't know is obviously if that would be the release of the WiiU or the NX version or both. If both versions launch the same day, then obviously so will the system.