I agree cozie and think he just rants what ever is in his head at that moment. I read this tweet as saying that the Dems are trying to set up Trump and co because they lost the election. So Flynn's request for immunity is not for actual really criminal acts, but from the fake crimes the Dems are making up about them. Basically 'its all FAKE NEWS! LIES!!! Bad LOSERS! SAD!!' or words to that effect. There will be hardcore supporters who will go to their graves believing Trump is being set up. Most people will see these tweets as increasingly deranged.
That was my reading of the tweet too, Bigly.