Haha, I totally understand speculation and theorizing-- it's fun! But the way your initial posts framed it, it sounded like you're angry about it. It's subtle, and maybe I'm overthinking your language, but you could have phrased it as a question "Is Discovery really in the Kelvin timeline?" and debated the evidence for and against it.
Instead, you said it's "all but confirmed" and you seem adamant about not having a discussion, but trying to prove that it's in the Kelvin timeline, despite very little evidence.