Meaning of "authenticated" in name validation section

[ckcr4lyf]

First off, apologies for this issue right after #642 was merged. I thought I had left a comment there but apparently the feature in Github I used left a "Pending" comment that doesn't gets submitted till I complete my review.

In essence though, the change I wanted to ask about is:

draft-ietf-tls-esni/draft-ietf-tls-esni.md

Lines 911 to 912 in 29fe76c

	Prior to attempting a connection, a client SHOULD validate the `ECHConfig` to
	ensure that the public_name can be authenticated. Clients SHOULD ignore any

what does "ensure that the public_name can be authenticated" mean in this context?