Interestingly Keanu stopped herself from outing something, when Nick said something about when before was he known as an abuser?
Related? Do some creators know stuff and are managing to keep it quiet?
Yes but he said something to her along the lines of "when was I ever known as an abuser before you.." and she started to say something, along the lines of not a public person, and shut up.
I'm fairly sure I didn't imagine it
That was one of the more interesting clashes and it's among the top three that seemed to enrage him most, so it may be worth revisiting for a moment. From the context I interpreted her statement exactly the way you did, namely a tease that there's some additional
abuse story out there that she's holding back for now (whether the keyboard story or otherwise), though on a rewatch it's also notable for a seeming Freudian slip in Nick's misinterpretation that she must have been teasing some new
infidelity story, as if he's been obsessed with the latter even though she never brought it up:
Karl: Are you worried about slampiece at all?
Keanu: Have I what?
Karl: Are you worried about slampiece? Have you warned her about him or anything?
Keanu: I don't know her.
MAPton: So women you don't know, it's okay for them to be subjected to abuse?
Nick: Like an obvious abuser, it's not even in question.
Keanu: You're an obvious abuser, through text messages that April sent me, [that] I just read to you, what would you like me to say?
Nick: If I'm an obvious abuser, why didn't anybody know until your brilliant revelation, like Jeeth Chrith [in South Park's Mr. Slave voice].
Keanu: I bet your fucking... *conspicuous halt* I don't know... *conspicuous pause*
Nick: That I'm fucking what, or who? Just spit it out.
Keanu: Nothing... maybe there aren't public people that don't want to talk about it, that's all I'm saying.
Nick: So there aren't public people, that I'm fucking, that's amazing.
MAPton: Like April. April has a private life now, and doesn't want to be public, but again, Aaron reads chats that insult her every day, and Aaron puts lyrics in his theme song that keep calling her a cokewhore-
Keanu: You guys just read her text messages at a festival on a large screen-
[Cacophony of people shouting over each other]
Nick: You just said I'm - you just accused me of fucking other people who aren't public! What is wrong with you, you're the du-
[Timestamp 5:02:55]
From the preceding context it's a reasonable guess that she was about to say something along the lines of "I bet your fucking [wife knew you're an abuser]" or "I bet your fucking [wife would beg to differ]" or the like, but she cut herself off at just the right moment to let his paranoia about what Keanu might know get the better of him, setting him off into another impotent rage.
In fairness, the tangent he deviated to
could be explained by his swiss-cheese brain missing the context enough to conflate her obvious use of "
your" with what he mistakenly thought was "
you're," leading him to assume she was about to say something along the lines of "I bet you['re] fucking [insert alleged sidepiece here]," followed by his reactions continuing along that track. Not preferring to give him any benefit of the doubt, I'd just as soon conclude that his mind jumped straight to that misinterpretation
because he's obsessed with specific instances of infidelity that Kayla doesn't know about, and he's terrified that Keanu might have found out about them, whether from her still-opaque communications with April and/or from her being well situated to hear all sorts of girl gossip about notorious sex pests through her involvement with Simpcast.
Either way, it doesn't really matter whether Keanu
actually knows anything along those lines and all that matters is what would motivate him to bring up that topic when Keanu never even brought it up in the first place. There must still be some skeletons in the closet that her cryptic tease reminded him of and he's panicking at the thought of which one she'll drag out next.