I don't think there is any rule stating that HN discussion need to stay precisely on the topic of the article discussed. In fact, there are many about topics just tangential to the main one.
Unless Apple products are being made in the concentration camps, it's not even close to tangential to the topic of environmental sustainability of Apple's supply chain. It's just trying to derail the discussion by bringing up political issues.
https://www.csmonitor.com/World/2020/0305/Are-forced-labor-U...
https://qz.com/1811305/nike-apple-linked-to-forced-uighur-la...
https://www.newsweek.com/religious-freedom-watchdog-amazon-n...