Yeah, maybe! What I've been telling people who are getting into Discovery, but, not familiar with past shows -- that moment is sort of a Rogue One for Trek. There's a two part episode detailing those events called In a Mirror, Darkly, from Star Trek: Enterprise that's worth checking out for curiosity sake.
I don't know. Truth be told, much of Enterprise's fourth season is incomprehensible to people who have no familiarity with Star Trek, In a Mirror Darkly especially.
Actually, one doesn't need to see Mirror Mirror or In a Mirror Darkly to be able to know what's going on. There's nothing new about evil parallel universes.