Now that @Gargron's post is deleted, I can't reply to it. Oops! I start a new post, "unlisted", @'ing Gargron at the start.
Although this new post is frankly pretty confusing without the context of the post it was replying to, people start boosting and faving it
What is the visibility of posts beginning with an @, but posted to the public timeline rather than as a reply? It seems to me sometimes theyre shown with no filters at all, whereas replies would be filtered to mutual follows.