Europe has a similar problem with farmers saying that had seen vultures (8kg) eating their 800Kg cows alive. Something that would be obviously impossible without vultures learning how to use a firearm or without finding dozens of severely hurt and dead vultures around after the battle (something that strangely, never happens).

Thus farmers can now ask for a compensation for each old cow that slips on a clift, or has a disease too expensive to treat.

Maybe Keas are enough smart to eat an alive sheep (a lamb would be much more probable), maybe once in a blue moon, but disinformation and rumour spreading for money is a global problem that biologists face.