I found a github link in there, it was a little buried 
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Nostr Relay with Dashboard🌐 Choose Paid, Public or Invite-Only Mode👥 Self-Host Your Posts and Code📂 - H.O.R.N.E.T Storage
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I think nestr is something completely different.
I think Nestr might still be a WIP.
I'm suspecting is the CDN part of their relay management software (?)
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H.O.R.N.E.T Storage
Nostr Relay with Dashboard🌐 Choose Paid, Public or Invite-Only Mode👥 Self-Host Your Posts and Code📂 - H.O.R.N.E.T Storage