alt Hacker NewsComments are marked dead by automatic processes, not through downvotes. They're dead before anyone sees them, and you can't vote on a dead comment. amangsingh's comments have probably triggered some automated moderation. Probably at least partially because they sound LLM-generated.
Spot on regarding the automod. Unfortunately, the way I naturally structure my writing almost always triggers a 50/50 flag on AI content detectors. It is the absolute bane of my existence.
The filter instantly shadowbanned the Show HN post when I submitted it, which is why the link was dead for a while. Thankfully, human mods reviewed it and restored it. The link is fully live for a while now!