Down here in South Africa we have a similar network. We have had quite shite connections down here for so long that a mesh network was one of the few ways to get a good connection. Link for our map of Cape Town. https://wind.ctwug.za.net/index.php/nodes

"The network connects directly to the internet backbone, so we do not rely on an ISP."

That makes no sense. I doubt they're a tier-1 backbone themselves, they have to be purchasing transit from an ISP. It feels like lots of the docs are written by marketing-type folks. Also there's a weird diagram that insinuates NAT happens before bgp peering with the not-ISPs they buy internet from. Weird shit.