That forced sterilization is happening is fact. Twitter isn't taking a "stand" on what the truth is (it is telling that you put truth in quotes). Twitter is simply deleting tweets that spread misinformation, whether the misinformation is about US election claims or pretending that there isn't a genocide happening in Xinjiang. Actions such as this that deter the spread of fake news on social media platforms are needed because bot accounts that rapidly repeat false statements are possible on the Internet.