People stake their Bitcoin address and message because they need other forum members to quote that message, and verify it. The most important is quoting it because if no member quote it, if a Bitcointalk account is compromised, hacker can delete that post.
I believe after 24hrs all post that you made is automatically being saved even though you go edit it you could still find it available in nijastic.space and you can't delete that that is why most of the addresses that is associated with some account are being filtered out without the knowledge of the real owner except such user also uses Nijastic.space before they could know their post is being archived.
Yes, you are right. Ninjastic will archive all original unedited posts. And this process is so fast that even if the post is deleted some time after you post it (Maybe their data recording is less than 5 seconds after posting), your original post will still be recorded. Apart from Ninjastic, there is still data owned by LoyceV