Neither here nor there still has any idea at all who Eimi or Hina is though, right? Just rrats about Eimi being that blacked communist troon or whatever?
Tenma has never outright been a 4chan anti, all there is on record is that she doesn't like seeing it in the discord, which between discord being infiltrated and monitoring everything you say and her needing to keep up with it at her office job where anyone could peek over her shoulder and see her scrolling past a mile long paragraph about Yamanbas, I kind of see her point.
But even if she was, of course she knows a lot about it, her best friend and most of her coworkers are chronically addicted to it.