That's all well and good, but has nothing whatsoever to do with the Border Patrol telling the Mexican government where the Minutemen are. The Minutemen do NOT make arrests. This would be like the BP telling the Mexican government who and where I am when I report suspicious activity on the border. Actually, after reading this I am wondering if they do give out info on me to the Mexican government.
Also, everything you quoted comes after the arrest, not before. Are you saying that the Mexican government should be told where CBP and ICE officers and agents are operating, as well as DEA and other LE that operate on the border? As per some international law? I am now really wondering if we do that- but we should not being doing it!!!
Unfortunately, it is very likely that this does happen.