It's the same underlying story; note how the thread is much the same as the earlier one. In such cases we treat follow-up posts as dupes unless they're particularly substantive or contain significant new information. I don't think this post quite clears that bar. That is not an opinion about either the TSA or the lawsuit.

We started moderating HN this way after the Snowden deluge of 2013 in which the front page was dominated by follow-up posts for a long time. Many users complained about this, and they were right, yet the underlying stories were obviously on-topic. We came up with the current policy as a way to balance the concerns.