She didn't tweet him directly. It was a general twitter post. If you look at her list of people she follows it's mostly video game streamers and youtubers. She probably followed dsp one day and he followed back. With less than 100 people on his following list dsp probably reads everything on his Twitter feed.This is the first public interaction. Did they meet before this?
What even is this? Tweet DSP with a problem and wait a day or Google the question and wait 2 seconds. Phil has no idea how to use OBS, why ask him?
One of them had an agenda. Kat wants to use Phil or Phil wants to use then first girl he meets.