The Sun is famous for their exaggerated news, and this is one more instance.

Maybe.

But it's within the abilities of a hobbyist to build a dragonfly-sized drone with video capabilities. It's not beyond the realm of imagination that a mosquito-sized one could be built by entities who have real funding.

It's the power supply that will be your problem.

I mean... that is a video of a tiny drone. Make of it what you will, but the proof is in the pudding.

Most of us probably aren't envisioning the Dune hunter-seeker being developed from this, but even a simple cavity resonator would make it a weapon beyond defending against: https://en.wikipedia.org/wiki/The_Thing_(listening_device)

In this day and age, just having video of something is not really strong evidence that the thing really exists.

Mao Tse-Tse Tung

Do these drones share the same weaknesses of real mosquitos such as air speed capabilities? If so a simple air filtration system and air movers/blowers near each door could mitigate them.