[rl3]

That post is publicly visible to me. It also seems to be the first post for the account, and is fairly substantive.

Moreover, I don't think it's even possible to reply to posts made from shadowbanned accounts.

[wtracy]

Okay then.

I didn't look at the poster's history, I just saw a constructive-looking comment that seemed to be modded to oblivion, and jumped to conclusions.

I had to vouch for the post before HN would let me reply, which seems consistent with how shadowbanned accounts are handled here.

[rl3]

Sounds like someone flagged it for whatever reason and it was flag-killed.