pinguinu [any]

This is true, but it’s so funny that the source chosen is

ADF is a professional military magazine published quarterly by U.S. Africa Command to provide an international forum for African security professionals

It’s all ESP32 devices, I don’t know if Kindles use that chip (probably not). Any device that’s mildly powerful won’t be using it anyway. It seems like it’s their open source project for Xteink’s ereaders including some e-ink displays, not an independent platform, so it’s not gonna be useful for third party devices.