Now that's odd right? Account created in 2019 and not a single comment until now. The comment is also just a quick rebuttal with no substance, the type of comment made by someone who you'd think would comment often.
So either
People who manipulate opinions for some group, country, or company on social media keep accounts stored so when needed they can perform their job.
Or, this person read hackernews for 3 years and never commented (ignoring deleted comments) until just now and only to basically say "no".
“Please don't post insinuations about astroturfing, shilling, bots, brigading, foreign agents and the like. It degrades discussion and is usually mistaken. If you're worried about abuse, email hn@ycombinator.com and we'll look at the data.”
Sometimes people lurk because they know they’re going to be scrutinised by self appointed gatekeepers and so try and wait until they have something perfect. Only to later just jump in the pool with something simple.
Your either is not complete, there are plenty of other possibilities.
So either
People who manipulate opinions for some group, country, or company on social media keep accounts stored so when needed they can perform their job.
Or, this person read hackernews for 3 years and never commented (ignoring deleted comments) until just now and only to basically say "no".