The NYT headline may be loaded and headlines fitting Betteridge's law may be facile, but there's nothing inherently "Opinion" about it (though the subheading saying "Our tech columnists discuss..." makes it pretty clear what you're about to read).
Meanwhile Greenwald states his Substack is where he's publishing as an independent journalist, so unless you want to start referring to him as an independent pundit (or entertainer, in the style of Fox News primetime), calls for journalistic integrity should absolutely apply equally there.
Absolutely. But Greenwald is writing as a private individual journalist, clearly his own opinions. There's no journalistic integrity rule that says an opinion column cannot be sensationalist, overblown, or even downright wrong.
Also, accusing a man like Greenwald (who resigned from the media organisation that he founded because he disagreed with the direction it was taking) of poor integrity? That's a bit off-base.
Meanwhile Greenwald states his Substack is where he's publishing as an independent journalist, so unless you want to start referring to him as an independent pundit (or entertainer, in the style of Fox News primetime), calls for journalistic integrity should absolutely apply equally there.