On my plasma 5.24.6 I have this entry that seems deprecated, supposedly to create links for files and folders to an activity or other.
I couldn't even find what linking a file to an activity could mean. I was expecting something like opening that file/folder into a specific activity, restricting it to that activity - but that's not it at all. (For that window rules are needed.)
This is the only meaningful info I could get: it should create a link on the desktop in a given activity if the option was selected somewhere...
Here there is an old discussing showing this might have been dead since Plasma 5.2.
If this is true it seem like a deprecated feature, the option is absent in settings, and a google search gives nothing more.
Can I remove that buggy menu entry?

