Did you PM Fivestar4everMVP to know he is not the one that locked the thread before asking this question?

But even if you sent him PM and he told you that he did not lock the thread, that does not means that a thread that is 5 pages long should not be locked. People are enjoying now, unlike before that long threads were often locked on the gambling board. It might even be moved to off-topic in the past.

https://bitcointalk.org/index.php?topic=5559635.0 —!?

As far as I know, that's a name that someone has already taken and has been reserved^[1] or restricted^[2] by the admin.

Edit: added some links
1. https://bitcointalk.org/index.php?topic=5216451.msg53569598#msg53569598
2. https://bitcointalk.org/index.php?topic=5361620.msg58012303#msg58012303

Yes, that's true, but I've also experienced something similar. I received a message from a guest author informing me that my post was deleted, stating that it wasn't on topic, even though my quote was appropriate. Some posts were deleted by the guest with similar messages.

I still don't know why. Can anyone enlighten me?

However, does it mean when choosing a username there should be a type of names people shouldn't pick?

Interesting information from the OP, who is an artist.
However, my suggestion is that the OP should explain what kind of artist you want to showcase. As everyone knows, there are many types of artists, including music, dancing, and so on.
By clarifying and explaining what kind of art you intend to showcase, perhaps everyone here will understand your intentions and your direction. Thank you, and keep up the good work.

Very appropriate and wise response, and the guess from rat03gopoh is also very interesting, indeed sometimes there are bugs like that, the dev needs input or corrections from all users who feel the benefits of this forum, so that in the future it will be better and more comfortable

I also happen to think it looks better.

Less text and highlighted information, allowing for faster reading of the notification.

As rat03gopoh guessed, this was a bug caused by the special character in his name. I fixed it now, thanks!

^^^
Just a guess, this means a display failure bug for usernames that use special characters.