I think it's some reverse proxy routing magic that detects if the path is a "/nevent", "/npub" etc and uses the njump server, otherwise uses the landing page.
It could be changed to detect email-like or domain-like URL paths too, and "/p/..." and "/e/..." paths that njump supports.
Or njump.to could do that work and not redirect to nostr.com when the path is a NIP-05.
I think we only use /whatever for njump on the site. So we could just pass all those and let njump handle?
We do also have that caching issue again, seems like it slowed.