He should now have his noggin jogged by now since it’s back all over the press and Internet. He doesn’t have any credibility since he’s a silly Slimes’ scribbler.
Here's the 2001 quote that Trump is citing:
In Jersey City, within hours of two jetliners' plowing into the World Trade Center, law enforcement authorities detained and questioned a number of people who were allegedly seen celebrating the attacks and holding tailgate-style parties on rooftops while they watched the devastation on the other side of the river.That's not exactly comprehensive proof of Trump's "thousands and thousands" claim.
Also, I can see why anyone would not remember such a sentence in an article he wrote fourteen years before.