One of us is mis-understanding things.
You seem to be saying that the account "Cytronex" is shadow-banned, but it isn't, so I'm not sure what you're saying. This comment[0] has been downvoted, and that makes the comment display in a light grey, but that's not the same as shadow-banning.
Speaking from experience and experiments here.
HN has a lot of anti-abuse software. It's possible that you saw some of its effects and drew an over-general conclusion.
You and anyone else are welcome to email hn@ycombinator.com if you have questions about what's going on with your account. We're happy to answer questions, and to roll back bans or penalties when people give us reason to believe they will use the site as intended.
Even so, if anyone keeps getting shadow-banned then I'd expect that they'd learn how to make comments that don't get them shadow-banned. If they just keep banging against the moderation without changing their behaviour and without adapting to the community, maybe they really don't belong here.
<fx: shrug />
Finding it hard to care, given the comments I've seen.