>Why would this even be redacted?
It confirms they were spying on Flynn, as his name is not part of any redacted portion. Also, thus far they found no wrongdoing. It also indicates Obama was aware of that spying
>I know that, but for what actual reason did they have to redact it?
At that time, that information was classified
Yes, the conversation was known for years. But, we now see who knew about it. "Anons knew", but we are seeing actual declass now