Ask HN: Are posts about Reddit actively suppressed?

I've noticed that several posts about Reddit get many upvotes but never make it to the front page anymore or get pushed down immediately. Looks like there is an auto-suppression in place.

https://news.ycombinator.com/item?id=36412619

https://news.ycombinator.com/item?id=36421483

https://news.ycombinator.com/item?id=36423313