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They are likely tweeted 10-15 minutes before being broadcast. If I had to bet, it was tweeted when the score was 4-1 or something, or maybe even in game 1.
No not that slow. They are delayed, though. Obviously we need to screen tweets to make sure they are PG-13, which takes some time. Properly encoding the stream to ensure a high quality signal also takes processing time, so viewers on twitch and youtube see the game with ~2min of delay compared to the production team live on site, so even the fastest tweets will still be a couple minutes old.