XC-VMC Lear 45
I believe the pressure exerted on the Mexican Government to release information to attempt to quell unrest in an untrusting public, was far greater to National Security than the families of those lost.
Considering it was Mexican Government jet, in the service of their Nation, carrying Drug Czar VIP's at a time of immense violence and assassination of police, judges, and Govt. officials throughout Mexico.
As for the actual information released, it is factual the Lear failed to slow when requested by ATC, and were gaining on a much slower moving B767.
There are four previous private jet accidents, with completed investigations, brought down by following airliners too closely. So although the completed investigation is far off, the implied cause is clear, though yet to be confirmed.