Earlier quoted context omitted.
It's not a weird choice, as it still shows that merely being able to find calls for violence is not sufficient for banning an app.
This is about moderation efforts, not content. Apple/Google think Twitter has good enough responses to reported violations. Since content isn’t pre moderated it’s obvious that it will always be some of that content. The banning of this app isn’t because there are death threats but because Parler couldn’t present a moderation strategy to uphold their own ToS.
Maybe, or maybe they just don't like Parler. I'm skeptical whether a serious attempt to clean up violent speech would ever satisfy these platforms, especially when what constitutes violent speech is determined by people who are extremely ideologically hostile and uncharitable towards you (eg. see how Twitter construed Trump's last tweets.) But we'll never know because I don't expect such a reform effort to be made.