I suspect your shadowban is related to how new your account was, its de-facto low reputation and its even lower reputation due heavily downvoted comments you made: https://news.ycombinator.com/threads?id=turdistheword
I believe domains can also be downranked/shadowbanned separately from users. Given that this Ask HN post went through OK, I am guessing that is more likely here. And I would agree that articles from the Guardian are almost certainly going to be off-topic based on the guidelines. If the post is on topic, you can always reach out to moderators.
New accounts are only default shadowbanned when created from a known VPN IP or a known "bad" IP for which user creation isn't yet banned. The shadowban expires after a couple months (?) which is why sometimes you'll see accounts making their first visible comment even though they were created some time ago.
Accounts with a high comment flag rate are timed out. New accounts with a sufficiently high comment flag rate are permanently timed out.
Accounts likely operated by known trolls are manually shadowbanned.
