The initial mention of a drone was probably an error on the part of a low-level employee, who automatically assumed that aerial photography came from a drone.
No company is going to send out drone operators to individually check all policy renewals.
The company is likely to be subscribing to a service like
www.nearmap.com
With their integration of GIS, it would be a simple matter to pull detailed, recent imagery for all policy renewals and possibly even have AI analyse imagery to find the things the insurance company might be concerned about.