The repo does mention the Pi. I just forgot to talk about the Pi specifically in the article, sorry. https://github.com/MichalStrehovsky/uefimaze

Raspberry Pi (assuming 4?) supports UEFI externally. bflat can target Aarch64 ISA and UEFI as a platform producing compatible binaries that can be booted up without any further post-processing.

It looks like the article was intended for x84 UEFI and then they changed the title to Raspberry Pi for the clicks. Nothing in the article applies to the RPI, nor mentions it.

The only RPi "thing" I could see was the tricolor triangle at the start of one of the videos.