Like this? https://www.temu.com/2pcs-led-earrings-illuminated-with-whit...

You probably didn't watch the video. These are exactly the earrings used in the video to create the matrix LED ones. These earrings are just a fake jewel with an LED back light.

The article showcases a programable LED matrix, which opens up a lot more possibilities.

Those appear to be static. The ear rings in the OP are way cooler. But damn, for 4 dollars? I didn't expect even those to be that cheap.

In parts. But now automate the production part. Will cost you at least 50k to get done. Not an extreme amount, but still.

I just got a few for my daughter, on Ali Express they are less than $2!