I couldn’t find the exact specs in the post, but it’s most likely unable to run Steam because of the processor in use. If you’re not familiar the screen shots are of a very popular emulation front-end called Emulation Station.

Related, a few years back I got in the hobby of building Raspberry Pi (Zero, 3, and 4) into Gameboy (original gen 1) shells. Economies of scale sure are nice, because even the raw materials for building one cost me more than $80.

EDIT: I found the specs (or someone quoting specs) and it looks like it is comparable to Raspberry Pi Zero and does not have wireless. That would make things like Steamlink a non-starter.