You've been asked, more than once, to not post your solutions in kata discourses. There is no need to, there is no reason to. Please don;t do this.

Please don't post solution in the discourse page.

I don't know how stuff like that is usually handled...

Marking it as spoiler is usually enough, because it hides such posts from users who didnt solve the kata.

Can someone delete the posting? I don't know how stuff like that is usually handled...

don't post solutions in the discourse

submit your solution; that makes it visible to everyone that already solved the kata

don't post solutions on the dashboard