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The paper [0] contains the key number: average power of 3.6 μW so enough to power the lowest power electronics but not much more.

[0] https://www.cell.com/device/fulltext/S2666-9986(24)00108-X

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And this is an academic paper so even though the reported number is given as an "average" it is not necessarily going to be typical for application and it is fair to expect that "average" means "best average".

It's a good exercise to compare these numbers to a CR2032 coin cell - it takes about a 6 μW load to drain one over its shelf life of 10 years, assuming 20% derating for aging.

Here’s the video mp4 of the little bird sorta powering some tiny LCD screens:

https://www.cell.com/cms/10.1016/j.device.2024.100318/attach...

looks like a high voltage generator using capacitor plates similar to a Wimhurst machine.

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