After deleting the user, the display name remains.

[User2]

Hello.
I change the user names on my forum so that the names are on a certain principle.
Then, when I delete a user, the user's posts display not the name that I assigned, but the name that the user came up with.
I would like that after deleting the user, the user's posts would display the name that I specified.

[shawnb61]

I logged this as an issue a while back:

https://github.com/SimpleMachines/SMF/issues/8173

[2.1] [3.0]: poster_name is member_name (private) not real_name (display).
...
This may be considered a privacy concern. The main reason folks request deletion is for privacy reasons - and the way it works now, upon deletion, the member_name ends up getting exposed.