Microsoft's use of the word "METRO" officially?

I thought Microsoft said they never did and will not use the word "METRO" officially to describe their UI.

Browsing their Developer center site today, I can't help but notice the title of the page and the big promo smacked in the middle saying: "Develop great Metro style apps for Windows 8"

Look here:

So is this something their in-house designers forgot to remove, or is this not concidered "official" use?