I would think, or hope, that this guideline is geared towards protecting a years-long effort such as writing a performant, feature-rich terminal emulator, rather than a comment which takes 5 minutes max to draft.

Not clicking on a documentation link on a technical project is the definition of a shallow dismissal in my opinion.

The original commenter posted a shallow dismissal by putting the effort into posting a comment without clicking a single button on the page :)

The feedback provided wasn't helpful. You're absolutely correct in that shallow dismissals aren't kind, but you're wrong about who was shallow and who was not. OP didn't dismiss anyone, nor was their comment shallow. And they don't owe you or anyone else anything as far as "explanation" goes, and they can filter out whoever the hell they want. Click the link and look further, or don't.

Meanwhile, dr_ketyn's comment was both rude and not constructive in the slightest (here's a tip: starting feedback with "I hate this" isn't constructive or kind).