It is very clearly NOT official. There are a ton of unauthorized SMB guides floating around. That one does indeed look Chinese.
And yes, APE, of Earthbound fame, did indeed design all the official Mario player's guides until recently. For the older ones, looking for the distinctive APE logo is how I spot authorized guides, since, no, I actually cannot read Japanese. I think, though that the gold on the SMW guide says something along the lines of "master's guide" or "expert guide" since that's what this is. The one with Mario on the cover was the traditional walkthrough, the Luigi one is all about the secrets and stuff. Incidentally, there may be a few new "unlimited 1-up" tricks in here that I don't believe are very well-known in the west.