Of course you can, and there are plenty of ways to do so that don't break the site guidelines. Cheap, snarky one-liners are not the way. If someone's posting about their own work, there's no need to be disrespectful.

It's also not helpful to post such a clichéd dismissal of what someone else says or their work. That's in the site guidelines too.

https://news.ycombinator.com/newsguidelines.html