i think its mostly to do with reach .. road only telemtry is much narrower in scope compared to a drones reach and also purpose built for mapping buildings, topography etc
This ban makes sense if they suspect the enemy is covertly scanning using unsuspecting users' drones. But if they suspect foreign actors are using the drones to scan, well they won't be stopped or slowed down by the ban. Whoever is interested in targeted mapping of buildings and specific areas won't be put off by Lidar drones not being commercially available. Independently Lidars and drones still are, and combining the two for malicious purposes is a no-brainer.