If I recall correctly, those images where taken outside of a prison somewhere in Mexico state after threats of a massive prison break. Also, it was prior to 2006 so natuaraly all to do with the army before 2006 will look ancient.
Why would they want to spend money on a light tank from 1953 which dose not fufill any of their needs in anyway. Those are even older then the VCI's which they are trying to replace.
Not only that, the AMX-13 was already obsolete after their showing in Six Day War in 1967 even despite some were upgraded. They were pretty much pointless against Egyptian & Syrian tanks like the T-54/55 and T-62 tanks and after the war, Israel sold them to a number of nations. So, ordering these would be pretty much stupid and a waste of money.
well i still think they should get the stingray light tank add some lav-300s some lav-200s some v-150 comandos and v-100 to there regular forces there marines can get the amx-13ifv the, erc-90, panhard vcr,DN-V Toro,DN-IV Caballo,and Véhicule Blindé Léger