Why is the comment from godsplan1 downvoted to death?

Their account was banned. dang explains why they were banned in a reply to a previous comment.

I had to figure out what previous comment you mean; for anyone similarly lost, see the account's previous comments, there is only one other.

Interesting, I would have expected to show the commenter an [you are banned] error or similar instead of just not showing the comment to others.

Edit: Thanks for explaining!

The comment is gone. What was it about?

Dead comments can be resurrected by people vouching for them. If you think a comment from a banned account is something that should be shown, click on its timestamp and then click "vouch". I usually look at the user's other comments first, to see who I'm vouching for.

More info here: https://github.com/minimaxir/hacker-news-undocumented