[zokier]

Those look like normal 2.5-3mm LEDs, that is big difference to 1mm² LEDs. The circle disc from OPs link has 2.5x higher LED density, and they could be probably packed even more densely in a grid.

[karlkloss]

Looks like they're WS2812B-2020, like on this PCB:

https://www.wemos.cc/en/latest/d1_mini_shield/8x8_rgb.html

[karlkloss]

BTW: The 2020 are super bright, but the 1010 not so much.