Buffered transmission is unlikely to help; after all, the surveillance target could store the received stream and look for patterns - it would only delay detection for the length of the buffer (which often would need to be kept short due to the real-time nature of much surveillance.

Granted, you could obfuscate things by varying the buffer length and padding the data stream (as suggested near the end of the article) - but at some point, a high-value surveillance target will probably just assume that a nearby drone is probably not operated by an avid bird-watcher or something like that and just blast the drone out of the sky. (Preferably using a laser or better still lots and lots of microwave RF - tends to get the surroundings less aggravated than using a shotgun...)