The more I think about it, the more it feels like the hateful slurs thing is a lie. Okay, so he drops a negger bomb and gets banned. Makes sense and it's perfectly in line with what Twitch has done previously to people, including their big partners. But, a month before that incident, Phil got in enough trouble for repeatedly using racial slurs to the point they departner him, but don't ban him? Twitch is known for either doing absolutely nothing or overreacting with a ban. And, again, we've seen many times how they actually react with slurs, including with Phil himself, both in this most recent incident and that time he insulted some other partner and got a ban.
But, if he was just banned for using hate language, well, he's bound to get an email about it. Best case scenario, Phil is too stupid to realize the email wasn't for his partnership and assumed it was, but I think, in typical Phil fashion, he's lying to cover up what actually happened to avoid responsibility.
To switch from Phil speculation and move more into Twitch speculation, I think they're doing house cleaning. I've noticed with previous Twitch incidents, they tend to come in groups, unless it's something really big that needs to be addressed immediately for PR reasons. I believe they were introducing some new content policies a month or two ago, this might be them actually implementing them or going through recent reports and deciding to do something. I think that's how they finally noticed Phil has been blatantly breaking their same day upload policy, especially if people were trying to report him for stuff he says on Twitter. If he isn't making boomer tweets, he's tweeting about how he's immediately ending a stream and uploading to YouTube. If he's doing that and, presumably having a stack of reports against him/no affiliate person to stop him, I could see them just deciding it's easier to departner him, especially since, outside of our autism vortex, nobody really knows who he is.