A couple problems with your analysis: the population down-voting that post was preselected for those who had not already left/unsubscribed as /r/politics went downhill for the last couple years.

"Censorship" is a biased word, usually chosen by people who don't like what's being enforced. I would perhaps use the word "filtering" and it's perfectly common in a lot of subreddits. I don't think "censoring" is fair because all the same topics and events will still get discussed. The theory being that now, discussion starts with - on average - better reporting.