The number of subscribers is not the metric we used. We use a metric we call "activity". The behavior described in that blog post simply pointed out a bug in the activity metric.
Also, to be pedantic, it is not possible for reddit to censor anyone. Governments censor things, private entities do not.
To be pedantic, censorship is not limited to the government. Being private does not let you avoid the label of censorship.
And yes I know the metric is called "activity". It is just too suspicious that you let it rank well all these years and let it disappear from the front page just because a far smaller subreddit (by subscriber) was on the front page.
Also, to be pedantic, it is not possible for reddit to censor anyone. Governments censor things, private entities do not.