No, they weren't.
The closest Trump could get was TriBeCa, which is where it appears he is in the video...either that or the West Village.
You couldn't get closer than 5 or so blocks to Ground Zero unless you were a first responder, cop, port authority officer, firefighter, or any of the other emergency personnel.
Trump is lying when he says he was at Ground Zero, and he's also lying when he says that he "sent people down there".
You couldn't just "show up" and volunteer to sift through rubble; the police wouldn't allow it and it was also wicked dangerous because of the air quality.
That clip of Trump is pathetic because even if you were 5 or so blocks away from Ground Zero, the dust was omnipresent and would cling to your clothes the minute you arrived. Trump's suit in that clip is immaculately clean. So he probably literally did drive around for blocks while looking for a camera to posture into.
Pathetic. Absolutely pathetic.
And what's even more pathetic are the Conservatives who are carrying this shitty baggage.