This is posturing, 100%. The OAS is a useless hindrance to the project of American integration, but AMLO doesn't really care about that, he's just following the populist playbook of making ever more absurd public statements as a façade for policy failures at home.
What do you mean by "political failures"? All polls show him as the most popular Mexican president of the last decades, even facing strong opposition from the 1% and the mainstream media. I am sure he is not perfect and has made mistakes, but much less than the others.
