You misunderstand - no one was being routed to their backup servers. No one had their addresses cached. And if Amazon had brought down their DNS at the same time that they brought down their Amazon servers, then no one would ever have known who those servers were.
how does the DNS help to discover hidden servers when they are not listed in DNS?
That's what they are saying. They WERE listed, as backups. So, you would never have been routed to them, if the main servers were up. Only because Amazon took the servers down, their own system failed-over to the backup servers. Exposing them.
if they are listed as backups they are in DNS so they can be found before the other servers are shut down. this description makes no sense, i assume that the explanation of Parler is wrong and hopefully it will be explained better in the future
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