Honestly, all those lines IMO are from classic Nightwolf, he's just revealing some lore of past nightwolves.
It might be a preparation for future MK games having a different one though. We know a female used Kenshi's sword in the past for example, so maybe if they ever make a game about the Great Kung Lao tournament some of these are present there.
I agree with you mostly, but there are a couple of those lines where Characters that would recognize our classic NW either don't recognize him or are posing questions that seem to imply they don't recognize him.
Sub Zero: "As Grey Cloud, you dishonored your tribe."
Nightwolf: "That's in my past, Sub Zero."
Sub Zero: "Keep it there."
This is not the NW named Grey Cloud. Which is clearly the NW that Sub knows.
But is still iffy since NW says "my past" unless the Nightwolf 'spirit/mantle' or something is talking like a symbiote.
Nightwolf: "My ancestors speak harshly of you."
Shang Tsung: "I've put down Nightwolves before."
Nightwolf: "You'll find I'm a new breed."
Our Male Nightwolf and Shang Tsung would have met before.
Jade: "What powers did your Great Spirit give you?"
Nightwolf: "Fight me and find out."
Jade: "Invitation accepted, Nightwolf."
Jade is unsure what this Nightwolf's abilities are. Implying she's never seen them before.
As I said though, this could be quite a reach, since due to all the timeline craziness, certain meetings in the past may have never happened.
So I get it. It's totally kind of a tinfoil.