Essentially you need a load balancer hosted somewhere that the traffic hits before getting routed to one of the 2 servers. That could be a VPS running Traefik if you prefer that.
Alternatively you could both run something like IPFS and run the static site on that, but anyone accessing the site would either need IPFS installed, or use a gateway hosted somewhere (Cloudflare has a public for example).
Why so angry?
This lets you share photos without directly exposing Immich to the internet.
I don’t see the point in getting so worked up over someones project they made and decided to share, it’s not like you’re being forced to use it.