I am a decently educated Chinese native speaker. The quoted Chinese sentence from Liu is not acceptable to me. I do not think it is a direct comparison against HongKong.
I am fine with him arguing about changing the political situation of China or whatsoever. And, actually, the discussion on that should be more open. However, I cannot agree on his view about changing China through colonial no matter what he tries to justify. And I believe no rational Chinese people will agree him on this.