I personally don’t think it is that vague.
We have an idea of what is implied with “cladistic mortification” thanks to datastream AFN3 - " The mortification of augmented foreign narodnya vessels proceeded as the following-time material realization."
We’re also the only group between the Drifters and Nation remnants that cladistic proving has been invoked upon. For Drifters the Triglavian ships “entered the cladeflow without proving”, engaging in “anti-cladistic mortification” with the goal of extirpation (Datastreams AEA1 to AEA3).
For the Nation remnants they were met with extirpation similar to the Drifters, but without the same sense of urgency.
If Drifters were the target they wouldn’t bother with cladistic proving. Their adaptation seems to be directly related to their study of us than actions of the Drifters. Plus Dogoda did state they were looking forward to our proving, which might have been more literal than we thought at the time as Zorya Triglav later addressed the citizens of New Eden.
I think it’s well within reason to have precautions ready just in case.