These controls seem to be making use of the account-tagging Twitter already does, some of the particulars of which leaked out last year: https://reclaimthenet.org/twitter-panel-blacklist-search-tre...

The current filtering is crude enough. There is no common agreement on who should be filtered and in what way, but everyone using the site is subject to one undifferentiated unremovable filter, whether they're in the naughty box or just trying to read some tweets. So now you'll get to invoke The Filter yourself at will. Big deal.

I don't rate the chances that Twitter will stop making more of this lazy dumb-AI, and put the effort into filter options that treat users as responsible enough actually to control their own feed. I do hope that people developing alternative microblogging tools can learn from Twitter's example.