The post you linked joined this month (January 2021), a tweet which is very recent, with no likes or retweets, from an account with zero followers. I don't see a good way for Twitter to handle this automatically.
It also isn't a credible threat of violence: It has no specific plans, locations, or times, it does not have the support of thousands of people and high-ranking politicians to gather and enact those plans, etc. If this manifested in a large movement that resulted in serious damage and harm (e.g. like the attacks on the Capitol) then this comparison would be a lot better supported.
It also isn't a credible threat of violence: It has no specific plans, locations, or times, it does not have the support of thousands of people and high-ranking politicians to gather and enact those plans, etc. If this manifested in a large movement that resulted in serious damage and harm (e.g. like the attacks on the Capitol) then this comparison would be a lot better supported.