It wasn't shadowbanned; initially it got so many downvotes that it was greyed out and marked "dead". When you see a comment unjustly downvoted to death you can

It wasn't shadowbanned; initially it got so many downvotes that it was greyed out and marked "dead". When you see a comment unjustly downvoted to death you can still click on it and "vouch" for it -- if enough people do it comes back to life, which appears to be what happened here.