Biogen doesn't pay for articles. Instead, they pay money to the Alzheimer's Association, which in turn says nice things about their near worthless AD mabs.
The shorts don't pay for articles. Instead, they help arrange meritless lawsuits against Anavex, counting on the fact that the law firms filing those cases will fill the Anavex news feeds, day after day, with press releases trolling for plaintiffs.
Try not to clutch your pearls too tightly.