They're just saying they won't encourage news/politics, not that they'll police them off:

> "Politics and hard news are inevitably going to show up on Threads - they have on Instagram as well to some extent - but we're not going to do anything to encourage those verticals."

It's not really that hard. There's only an algorithmic timeline, so they can just downrank all the shit they don't want there. Just downrank all posters who frequently use terms such as "Biden", "Trump", "White House", "Supreme Court", "the midterm election" etc. and you'll have suppressed it.