You know why this is unbelievable to me... It's from a party in 2000. By then Tupac was dead. Why was Jay talking about he's for the starving street nikkas when Pac had major hits about more than that. Why is he saying DMX got them same nikkas copping when DMX was outselling him, on tour with him and was putting out #1 albums back to back to back by that time. Why the hell is he bringing up Sauce money lol. Mind you.. We still at a party.. Why is Jay predicting Beans wouldn't sell 600k? But Beans debut already was out in feb 2000 and it went gold. So why the extra 100k? And wouldn't all the nikkas signed to roc be considered starving street nikka rap?
It doesn't add up. We only want to believe it cause it's Nas. Pretend Jim Jones said it... Now do you believe it?
it's very believable because three years later, his swan song was dedicated to asserting how he is the greatest and reminding the public why they should think so too.
Even (especially) in death, Pac and Big reigned supreme and were regularly touted as GOATs. I could see him feeling some type of way about that

Especially with that line on the song where he talks about "they got him battling ghosts."
The Pac and X jab was his way of trying to marginalize them and their fans
he knows that he could never touch the masses on an emotional scale like they did. AND they were outselling him
Nas was his most direct opponent, he was alive and could spit at an elite level.
and you see what he ended up trying to do to Nas
that's why this is believable.