We do not know that they can eat a person. We know they can kill a person however our shoulders cause issues for any snake trying to swallow us whole. Beyond that they tend eat things smaller than us. Consuming a 200 pound animal makes it very difficult for the snake to react defensively or flee from any threats.
Many local stories and legends report the anaconda as a man-eater, but little evidence supports any such activity.
Regardless, this is stupid and it seems incredibly unlikely to be successful unless they found a horse jockey whose "snake proof suit" somehow can withstand the constriction while still being small enough to swallow.