Pointing to the profile leads someone on the path of understanding why to trust tptacek on security issues. Pointing to his points on HN explains why lots of users here already know that he's credible in this area and will recognize his username and upvote his comments on this topic and know better than to blindly accuse him of being a just a random person on the internet.

The problematic, ignorant comment that has been flagged asserted that what tptacek says "means nothing to anybody else", which is a very wrong statement about his role in the HN community.