Looking through what's been written on this, it looks like we don't yet have any confirmation from "Anonymous Mexico"'s claim - but we have even less for the rebuttals. (The fact that the Daily Mail picked it up is neither here nor there - they're just a poison-pen letter delivery service).

I'm willing to give the Indigenous Americans' bulletin credit for having its heart in the right place, even if they didn't do enough fact checking to really nail the Mexican church on this one. Given what happens to people who challenge established power structures in Mexico (the Church has a much larger body count on its conscience than all the drug gangs put together) it might be a while before anything definite is established.