what is most interesting: Low of reports popped up over the last 2 days, saying that these drones do not have a thermal signature? how is this possible? esp.

what is most interesting: Low of reports popped up over the last 2 days, saying that these drones do not have a thermal signature? how is this possible? esp. batteries for electric drones get very hot very fast. Any ideas? Happy to discuss. Or - its just Guerilla marketing for "Amazon Drone Prime"?