It apparently never ocurred to Günther that only seasoned mergers would be able to understand his question.
Suffice it to say that if you don't have a person named Linda Fox as a family member or collaborator, you won't be able to help with this problem.
In case you've not encountered the term on Geni before, a "zombie" is a profile for someone who is actually deceased. but their Geni profile has them marked as still living. Linda apparently has a lot of these in her branch of Big Tree.. Profiles that are marked as living can often only be marked as deceased by members of the same (shared) Family Group.
The other reference is to another public discussion named "Zombies, Please" within which Noah T. from Geni (the company) offered to "kill" any zombies that are reported to them there. Günther has apparently tried that route but the zombies remain.
Does any of that help you to understand what the heck he's talking about?