ZSA keyboards create keyboard firmware (if I want to change key bindings, for example) in the cloud and flash it to the keyboard through the browser. I think the issue may be unrelated to the keyboard.
It seems like this issue is related to this here: https://forum.endeavouros.com/t/black-screen-on-boot-up-that-never-reaches-login-screen/
There is a slight bit of embarrassment for me not seeing that thread earlier.