A Subscription Event should be able to tell from where it is triggered

Suppose there is a subscription on the event OnAfterDelete "Sales Line"
It should only execute the subscriber code when it is not being called from codeunit 80.
How would that be possible?

Is the only method to do this using the this nice trick from Vjeko?

http://vjeko.com/detecting-current-object-type-and-id-using-some-funky-net-interop/