The raw storage density of a high-end sensing drone was approaching a petabyte even back then, so it is a plausible number if you have a large drone fleet. This roughly matches available COTS flash storage in ultra-dense form factors at the time. Live streams are likely going to be an extract of the captured data but you can always pull the storage array when it lands.
I haven’t done any math on 1.8 billion pixel video feed but I agree. There’s not enough radio bandwidth even for one drone to beam down over a million TB/day.