https://www.independent.co.uk/news/people/china-s-president-...
As a gweilo who lived 10 years in Hong Kong, roughly half the time single and half the time married, my perception is that speaking Canto/Mandarin is a much better leg up than marrying someone who looks local.
(Funny, though, conversations with strangers would generally start with Canto being spoken to my wife, who would give a blank look and point to me, and I'd reply in Mandarin, followed by the stranger speaking Mandarin at my wife while I replied in Mandarin and occasionally dropped English bread crumbs for my wife. So many people just found it too awkward to speak Mandarin with a gweilo and preferred to speak Mandarin at my obviously-non-comprehending wife. That being said, I have a deep affection for Hong Kong and its residents, and it's pretty easy to get around just speaking English.)
Do you have a credible citation for this, or are you making an assumption that there would be no more compelling reasons for Zuck to marry someone who's ethnically Chinese? (Asking for my ethnically 3/4 Chinese wife, my cousin's ethnically Chinese husband, and plenty of other European/Chinese mixed ancestry marriages in my social circle.)