Why have I received this warning if apparently I haven't asked any questions?
If I have asked a question and it was deleted, why can't I see it privately? This would be useful so that I can remember what the problems were with the questions I had asked, and avoid the same mistake.
Note that I've asked a question after posting this issue here on meta, so now I do have one question asked. But the point is, by telling me my questions from long ago weren't well received but not linking to them, I can't easily refer back to those questions and avoid doing again whatever caused them to be deleted.
status-declined
for now, since we're bound to the network-wide SE functionality for this and the post on the main meta is tagged this way, too, even if the functionality is actually partially existing, as explained in the answers.