Of course the topic of Uighur's genocide is political. It's even -extremely- so.
That you seem to not percieve it so underlines your misconception that any issue linked to the human condition could possibly not be.
"Everything is political" should not surprise you, it's not a new concept.
On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity.
Off-Topic: Most stories about politics, or crime, or sports, unless they're evidence of some interesting new phenomenon. Videos of pratfalls or disasters, or cute animal pictures. If they'd cover it on TV news, it's probably off-topic.
"Everything is political" should not surprise you, it's not a new concept.