As it was stated in the cited link
Can self-censoring end up with a question ban?
you need not worry about that warning, even if you are a new member. I have deleted lots of questions without any problem. You can delete a question if it has no answer, if it has one answer with no upvotes, and even if there are two answers withe negative scores. In other cases you are asked to flag your own question and ask for deletion.
The ban is enforced for new users with low rep when they have some question closed and/or with negative rating. Even then it is not a real ban, and in most sites (they can have different procedures) you are just restricted to one question per week.
It is not your case, anyway, since you received an association bonus in all sites