What you can see from the question is who voted for closing the question. What you cannot see is which close reason each voter chose. The exception to that rule is that if a question is closed as off-topic any of the standard reasons given by two or more voters will be presented with their names under it.
On that particular question you can see that three people voted for the standard close reason with the wording:
Requests for product, service, or learning material recommendations are off-topic because they attract low quality, opinionated and spam answers, and the answers become obsolete quickly. Instead, describe the business problem you are working on, the research you have done, and the steps taken so far to solve it.
I wasn't one of those three people, but my guess is that they saw the question as a request for learning material recommendations.
I don't think it is the best suited close reason for that question and as you can see I picked a different close reason. Which particular close reason I picked at the time I cannot remember.
What I see as problems with that question is that firstly those iptables rules aren't implemented in the best way, but more importantly that it doesn't show any attempt at narrowing down the problem to any specific rules in the ruleset.
That the question doesn't attempt to narrow the problem down to a specific rule and that it doesn't contain any information about what packets are actually being observed on the network is the reason I am not going to vote for reopening the question.