An inconsistency I noticed, not just in the article's linked above, but also in Mexican newspaper's, is that they cite the plane as being a Learjet 45, the datatag on the controller's radar shows "LJ25". Also, wouldn't the conflict alert have been going off as soon as the LJ got too close, or are CA's static, in the sense that they are set to a single separation minimum and do not take into account different standards that come into play with diff. weight classes ? Also, don't radar systems have a MSAW system as well ?
Also funny, if you look frame by frame on the Radar recording, that VMC goes from reporting the IAP published altitude of 9,700, to in the next frame not having an altitude in the datablock at all, which would put to rest my MSAW question. However, why didn't we see a gradual decrease in altitude as the plane came down ? Must have been scary as hell to be the piloting the helicopter we see cross VMC's trajectory right as he goes down (needless to say, scary as hell being IN XC-VMC).