API to remove Project

Hello I’ve developed a small helper tool to remove repositories (aka projects).
So it is using the api to remove the repositories on gitlab.com. (should also work with Gitlab CE)
https://docs.gitlab.com/ee/api/projects.html#remove-project

Appearently since 12.6 the project is only marked as “to be deleted” which currently takes a week.
The desired behaviour is to remove it immediatly.

There is this further information appearing like it would tell me what settings I could adjust to have said desired immediate removal:
https://docs.gitlab.com/ee/user/admin_area/settings/visibility_and_access_controls.html#project-deletion-adjourned-period-premium-only

And actually I’m quite confused about it.
There are these tags saying that a feature is in Core - not gitlab.com. Or Premium - not gitlab.com.
What does it mean for me, as my account which has been tested has the free plan for gitlab.com?
As I could not find these menues/options in my github.com settings. I’m rather clueless what is to be done to achieve the immediate project removal again.

Cheers, Lenny