I explained this to you some time ago (https://news.ycombinator.com/item?id=33445000): you were posting a plethora of unsubstantive Ask HNs that users were not only flagging but emailing us to complain about. That's a strong signal of community rejection, and after reviewing the posts as a moderator it was clear those users were correct.
Anyone who wants to check https://news.ycombinator.com/submitted?id=unknownaccount with 'showdead' turned on in their profile can see this for themselves.
I don't know what you mean by "the Fischer link" but the way this works is that we take away submission privileges from an account when they've been submitting too many off-topic or bad (for HN) things, and that causes the software to kill future submissions. So of course there was a time lag between the time that we did this and the time you noticed it—there always is.
Btw, I didn't say "unsubstantiated" but "unsubstantive", meaning that the posts you were submitting didn't contain much information (https://en.wiktionary.org/wiki/unsubstantive).