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Yep official too. Ebay is generally cheaper but you can get it on Amazon. https://www.amazon.com/Mobile-Suit-Gundam-Escalation-Confrontation/dp/1880656868/ref=sr_1_2?ie=UTF8&qid=1498367643&sr=8-2&keywords=Gundam+novel
Amazon also has the 2012 edition, and it's about 7-8 dollars cheaper IIRC.
I hadn't heard there were two translations! I have been reading this one:
Which appears to be the ealier edition of this
But both list the same translator and had the same translator preface. I will say that the first edition reads perfectly fine -- the translator mentions an even earlier translation which had slightly different name spellings (Sha instead of Char). I am not aware of any differences between the first and second edition besides the cover but let me know if you learn something!
Yeah the Gundam-san series is quite a laugh, here's the one I was thinking of: