> "...the Ley General de Población, or General Law on Population, spells out specifically the countrys immigration policy."
I don't doubt that Mexico still applies laws to illegal immigrants that it doesn't want applied to its own citizens who enter the U.S. illegally (laws that I agree with others in this thread in supporting for this country too). The problem with that very specific article that cites numbered provisions of Mexico's General Law on Population, though, is that it was written in 2014. It's outdated. Based on a revision of that law in 2015, all those embarrassing provisions appear to have been repealed. Just skimming through it, I don't see much left of the law but bland, political correct statements.
I can read Spanish, but for those who can't, the key expresion you need to understand is "se deroga" ("it's repealed"). [Dictionary] Here's a link to the government site for the LEY GENERAL DE POBLACIÓN (Última reforma publicada DOF 01-12-2015) . You can look up the numbered provisions mentioned in the humanevents.com article, and see what you find. It will probably be "se deroga".
I suspect that Mexico is now using less conspicuous ways to deal with illegal immigrants who attempt to stay in the country. In any case according to this 2015 revision it has covered itself from embarrassing reproaches about the wording of the 1974 law. Its conduct may still be hypocritical, but it will be harder to prove.
“bland, political correct statements” — “bland, politically correct statements”