Let's be clear on one thing.
The NYT article was about Russian attempts to recruit Trump campaign members. The four sources have repeatedly confirmed that the Russians have been caught trying to do it, and it's been independently confirmed by other outlets. So, yeah, the NYT article is basically confirmed, regardless of whatever Comey says. The open question isn't whether the Russians were trying to recruit Trump campaign members, because they absolutely were; it's whether or not the Russians succeeded.
Comey said this, about the article:
This can mean basically anything. Is he concerned that they got specific details of the intelligence operation wrong? Were the conclusions wrong? We don't know, because Comey didn't say.
What we do know is that Comey, by admission, was surprised and angered by the article. He had to seek out members of the intelligence community because he didn't know whether the NSA was watching Trump - in other words, he didn't really know what's going on either, and his assertion that the story is false is basically hearsay.
More importantly, Comey previously offered the senate a vigorous denial of the entire story:
Now, in case you aren't aware of the optics here, Comey has effectively claimed that President Trump was trying to extort him. He's claimed that Trump started grooming him well before the above report to the senate. That means Comey's account is fixed. I'll enumerate the three possible scenarios to make this point clear:
Comey was being honest in February, and honest yesterday. He sincerely believes the NYT article is wrong (for unspecified reasons) and his account doesn't change.
Comey was lying in February to protect his new boss. If he changes his account now, people will either figure out his earlier perjury, or they'll think he's perjuring himself today in retaliation against Trump. Either way, he's screwed - so his account doesn't change.
Comey was being honest in February, and since received new information showing that the NYT story is accurate. If he changes his account now, people will either think Trump's extortion worked, or they'll think he's lying in retaliation against Trump. Like the previous scenario, there's no winning either way - so his account doesn't change.
In other words, Comey affirming that the NYT story is false during the hearing doesn't mean anything more than Comey's earlier claim.
It also doesn't matter. You know, they'll probably never find evidence that the Trump campaign collided with Russian intelligence. What they do have, though, is a televised confession that Trump fired Comey in order to obstruct the FBI's investigation. Which is, like, a crime? So, yeah.