The Docker Hub page for this project says:
Maintained by: Wikimedia Foundation & Docker Community
However according to someone from Wikimedia this is "totally wrong".
The Docker Hub page nowhere mentions that it is "strongly discouraged" and instead gives a strong impression of being run and approved by Wikimedia.
The source of the mentioned page is here. I'll refrain from suggesting any changes myself as I clearly am not familiar enough with the project, but I'd really appreciate if someone could clear it up.