This is false.
Nas was already halfway finished with Stillmatic before the shyt TRULY popped off with Jay. He already was "back on his shyt" during QB's Finest. Nas wasn't even originally going to respond but Jungle and his QB brethren basically forced him too.
Nas's 2001 would be the equivalent of if Drake sent a diss towards Kendrick Lamar, and K.Dot not only dropped a response, but that response was so potent that it made Drake lose his entire cool and persona live on, let's say The Breakfast Club. On top of that Kendrick goes to war with Game, Ab-Soul, and Jay Rock; STILL comes out on top AND manages to drop a fire album. Accomplishing all of that in the final few months of a year is an incredible feat.
THATS what Nas did in 01. He completely pulled Jay-Z's card. Jay fukking Z. One of the GREATEST Mc's of ALL TIME, was shook by Ether and had no response but to diss a woman and a child. He also went at it with Prodigy, a legendary lyricist. Cormega, a true underground icon. And Nature, who is nothing to sneeze at. He sonned them. Dropped an incredible album, and all of this within two months.
That's a fukking MVP homie.
And this is no shade to Jay-Z or The Blueprint, which is a certified classic. You will NEVER hear me utter that Blueprint isn't a top shelf masterpiece. But Nas owned him, and Hip Hop that year.