OT: I fell into the rabbit hole of designing hardware (something like this). Just don't do it, it's super fun but it doesn't pay off: every SoC is different and you start with every SoC from scratch and waste tons of time. Prototyping is slow, you need min 2 weeks for every iteration (for smaller endeavors) and the worst, 98% of hardware-based business models are weak and don't provide any lock-in.
They're basing this (and their other product, the GameShell, which looks like an old Gameboy) on the Raspberry Pi compute module. I believe they have their own PCB to fit into their formfactors, but the SoC should be well-supported.
