Actually, that was only ONE media source - Mike Florio with PFT. He reported it and forced other media insiders to address it. But Adam Schefter said he heard about it but never could verify it, which is why he didn't go with the story.
I wouldn't necessarily compare the Dez video with this story. The NFL typically doesn't announce drug suspensions until it is ready, even though the information may be known and reported by an insider.
The same was done regarding Ro McClain. Media insiders leaked his "indefinite suspension" long before the NFL announced it.