Anyone heard of using mokey chow to kill raccoons?

Our hand that fills the protein feeders for us when we cant make it down said there was at least 4-5 bags of protein on the ground underneath every feeder from the coons. That shite is expensive. We switched our feeders last year from these (which they could get to with ease):









To these which has made it a little more difficult for them but they like to lounge on them and still empty it out somehow:






Anyway, he said put "monkey food" in the pens and after they eat it and drink water their stomachs will swell and they will die. He guaranteed it would work. We are gonna try it, just wondering if anyone has heard anything about this or had any experience doing this?