Russians in Hong Kong form one of the territory's smaller groups of expatriates and a minor portion of the worldwide Russian diaspora. Many Russians from China passed through Hong Kong in the 1950s through 1970s on their way to resettlement in Australia, Brazil, and Canada.
Russians in Hong Kong may be a minor portion of the worldwide Russian diaspora, but they form one of the territory's significant group of immigrants.
Based on the test, Russians in Hong Kong may be a minor portion of the worldwide Russian diaspora and also form one of the territory's smaller groups of expatriates, which shows that the statement is definitely incorrect. I think the system got confused because I replaced some key words from the original text with synonyms and changed the word order in the first sentence of the text.
( z1 contrast :ARG1 ( z2 possible :ARG1 ( z3 include :ARG1 ( z4 person :location ( z5 city :name ( z6 name :op "Hong" :op "Kong" ) ) :mod ( z7 country :name ( z8 name :op "Russia" ) ) ) :ARG2 ( z9 diaspora :mod ( z10 worldwide ) :mod z7 ) :ARG3 ( z11 portion :ARG1-of ( z12 minor ) ) ) ) )