I'm drawing a narrow but crucial distinction between telling true stories and journalism.
Journalism sets a higher bar. It has to not only tell the truth, but to tell it in a way that informs rather than entertains. That can be messy and dull. It doesn't let you connect things with speculation, even if you identify it as speculation. You can't even quite somebody's speculation unless you've ascertained their sincerity.
That's a very high bar that genuine journalists still hold to. It's unfortunate that this is usually boring and nobody wants to pay for it, and so much of what passes for "news" doesn't even try, but journalists do exist.
TAL tells stories. They are supposed to be truthful and never just outright lie the way Daisey did. But they don't have to double confirm every fact. They have a lot more leeway to shape a story by omission, speculation, opinion, etc. They don't practice journalism, though they do not explicitly say so. And by appearing in a medium best known for its journalism (genuine journalism), by stepping over the line they obliterated it.
So I'm trying to draw some careful distinctions. They did screw up, but not just in the obvious fashion. It's a story they should never have fun, not because of the lies (the second mistake) but because it's not their wheelhouse (the first mistake). They should have handed that story off to an actual journalist. Then later Daisey could have reported it his way, though he'd still be required not to simply fabricate. He would, however, have well attested sources.