That post had a link to a screenshot with percentages.
Dating from end of April this year but later in june someone else discovers in that same 8btc-forum another Alexa rating of safenetwork.io - this time without China.
A Quora-question, “Is Alexa ranking meaningful for websites in China?” is answered with an example of stats from both Google Analytics and Alexa where China is completely of the charts too for Alexa.
Quora in answer to another Alexa-question:
How does Alexa rank websites?
Poorly, unless the site is ranked pretty high on the list. I can move the rank of one of my sites from 3+million to less than 500k simply by using a browser that has the Alexa plugin when I visit the site once or twice a day.