Seeing you mentioned downvoted comments I arrived at this post.
>Could someone explain how?
Because there is no such thing as Rule of Law in China. Not in any sense where people understands it. The First Rule of Law in China is Rule of the Party. And there is no system in place that overrules the party. Unlike in the west where there is also something to keep everything in check. The law can also be interrupted in anyway as the Party member wishes, even changing / scrapping it now and trace back all previous wrong doings.
This is fundamentally different to how Rule of Law works in the rest of the world and in Hong Kong.
I am not suggesting Rule of Laws works the same everywhere. But for most developed country, they are at least on the same order of magnitude, China is completely off the chart.