is removed from the experiment list?

You mean archived ?

Well, the server actually has no way of deleting artifacts, since these are uploaded to different storage solutions (the server doesn't have the credentials to interact with these storage containers)

Makes sense, thanks!

Archived is actually just a "flag" on the Task. If you actually want to delete it (incl artifacts), in the archived view, right click and select delete

Yes, from archived experiments

Yeah, but after doing that a message pops up showing a list of artifacts from the task that could not be deleted