Make your own judgement (maybe let me know what you think about this), but to me it appeared it's something custom, maybe even tailor-made for this application. Instead, it's the Orange Pi 4, which has less software and community support than a Raspberry Pi, and has unnecessary hardware
like a GPU.
Thank you for this detailed review and the other related threads, my laptop is aching with all the open tabs that I want to read and use later on!
However, there is at least one difference to the Orange Pi4 board which I spotted while trying to move the WiFi antenna to outside of the metal container:
The 5VDC outlet is missing and there are cables soldered and glued instead of it, going to the hashboard instead of to the outside of the metal container.
I wonder why the hole is in the container and why it is labelled 5VDC OUT.
I think the board design was changed after the housing design was finished and so the hole was left in the box.
This former 5VDC outlet hole come in handy for routing the WiFi antenna to the outside. A rubber grommet helps to prevent chafing against the metal edges.