This is demonstrably false. Almost all servers that de-federate Threads still broadcast the RSS feed of your posts. This is available to everyone, even servers that are de-federated from yours.
If you don't believe me, test this out for yourself. Append ".rss" to the end of your profile URL (exampleserver.com/@username.rss), and see what happens.
Hell, if I wanted to build a search engine for the Fediverse and not use ActivityPub, I could use RSS instead and I could index most of the Fediverse -- whether your opt into it or not.
Let's stop spreading the myth that de-federation by itself prevents Threads from accessing your public feed.
