Enable showdead on your profile to see what the comment looked like. There are two states of being flagged; one is [flagged], which will still show to everyone but look like the comment you linked, and the second is [flagged][dead], which results in the comment being removed entirely unless showdead is enabled. (A comment can also be [dead] for other reasons according to https://news.ycombinator.com/newsfaq.html.)
