Hi Luk,
This deleted area issue is a major fault in the system. It has been raised many years ago by us here in VK, but there has been no progress.
Deleted references should count for activator and hunter stats up to the deletion date because the park was valid at the time it was activated or hunted.
This is an issue that should have priority in being fixed.
73 & 44,
Paul VK5PAS.