User blog comment:DaNASCAT/Technical Update: September 16, 2015/@comment-2093602-20150917120915/@comment-126761-20150917124138

I'll pass on a note to the team to see if we can get the preview behaviour improved. The inability to delete isn't desired, but it's part of other tweaks and we don't want to overcomplicate matters whilst we work through our security review - it's certainly not a restriction we want to have in place in the long-term.

In any case, I've deleted your page, as requested! If others want similar pages deleted, please feel free to request it via Special:Contact.