I'm not going to go into details of why I know (other than I'm an FPV pilot with a drone licence in my country and I have direct connections to pilots operating in a certain conflict), but you're more wrong than right. FPV drones have become a factor and like all new technologies, had an immediate impact that has since been blunted by adapting, eg EM warfare/jamming, "cope cages" around tanks, and the fact that it's still artillery killing the most soldiers.
FPV drones carrying anything more than antipersonnel grenades are heavy, with limited range and can have EW sensors track the control link signal sources that can then be responded with artillery.
Since a lot of the adaptions have happened, FPV pilots on both sides have become more about harassing the enemy than a strategic flipping of artillery doctrine (which was shifting to more mobile batteries before FPV drones came into the picture).
FPV drones carrying anything more than antipersonnel grenades are heavy, with limited range and can have EW sensors track the control link signal sources that can then be responded with artillery.
Since a lot of the adaptions have happened, FPV pilots on both sides have become more about harassing the enemy than a strategic flipping of artillery doctrine (which was shifting to more mobile batteries before FPV drones came into the picture).