I wasn't responding to any proposition, but rather to the pattern of how the account is using Hacker News over a long stretch of time. That's what the word "primarily" refers to, and it's the most important thing to understand.
Of course I replied to a specific post because any reply has to do that; but I was responding to the account's use of HN over time. That's the issue here.
I wrote the GP in haste and can see how this point wasn't obvious. On the other hand it should quickly become obvious to anyone who clicks on the link I provided (https://hn.algolia.com/?sort=byDate&dateRange=all&type=comme...), which is the purpose of providing the link.