This was a controversial case where a transgender person gave her name while she was on Milwaukee's TMJ4 News to talk about how she felt she was discriminated against.
She was kicked out of the sauna. She said "At this point I don't look very female", and that her drivers license reflects a male identity and she hadn't started hormone therapy.
Milo disagrees with her view and included a screenshot of that news clip to give some context of what someone's reaction may be when encountering her in an private setting.
I would not call taking a critical stance on a controversial news topic as violence. If you are undecided, it's not hard to find the presentation on YouTube and make your own judgement about what he said instead of reading other people's opinion.
It's not doxxing unless you believe TMJ4 also doxxed her when it displayed her name as she told her side of the story.
For what it's worth, I'm not a fan of him. But I like to correct the record when other people give a misleading spin.