It appears reasonable at first glance, but upon further reflection it seems unlikely that the internet was the only factor influencing the riots. If the internet wasn't available, it's likely that some other means of communication would have been used to spread the news that sparked the unrest. There have been MANY instances of people trying to take over a government building before the age of the internet.
This is true but I’m not sure you’d have had the critical mass of people primed to respond to those messages. Fox News heavily pushed lies about the election but the people who responded were part of a world which grew a lot in the later 2000s as blogs, Facebook, etc. opened up new audiences for ideas which would have been too extreme even for cable news.