>HN doesn't notify you in any way of this.

I'm not sure this is the supportive argument that you think it is, as HN doesn't notify users of anything akin to what you're discussing, be it positive or negative, ever. They don't have notifications whatsoever.

>Even this account is shadowbanned - and this comment automatically flagged...

No it's not. Edit: mea culpa, see response

>The only way I know this is through testing, of course...

How did you test this? Your single comment on a brand new account appears to be showing up just fine, as any new account would. Did you unflag your throwaway comment from a different account?

I get the feeling you pushed the boundaries of what was acceptable here at one point, and didn't like the result.