Willful ignorance offers a pretty big loophole to that definition.
If you don't fact check information, nobody can say you know it's false.
If you don't fact check information, nobody can say you know it's false.
I think also we could apply the (legal) concept of "reasonable and customary." If say the rest of the (media) industry reported X, Y and Z and you only did Y then that's not reasonable and customary.
No doubt there's grey area. But as it is, we're living in a "brown area" if you know what I mean ;)