Dark souls pvp can definitely be considered a fighting game.
it follows pretty much all of the fundamentals injustice does. ie reading or reacting to backdashes (or rolls in this case), spacing/footsies, MU knowledge, Frame data ect
while frame data isn't exactly known in DKS2 yet, it would be a pretty big factor to know if you can interrupt a followup on block or how much stun a greatsword does on hit when you have X amount of adaptability and poise so you know to either attack/roll out or just block