Probably panicking and waiting to be told what to do by the security services that have been using this.
All of the information leaked in the headers is already readily available through lawful interception.
Readit Newskylpytakki commented on O2 VoLTE: locating any customer with a phone call mastdatabase.co.uk/blog/2... · Posted by u/kragniz
So if the car has a SIM it probably could be removed to neutralize it without interfering with the eCall. But eSIMs might be a different problem...