A change was noted in omnics.txt on the lumerico website:
Allow: Tzolk'in
Allow: Imix ChikchanManik Imix ChikchanImixChikchanImix Manik Chikchan Imix Kimi Chikchan Chikchan Kimi ChikchanImixChikchanImix ChikchanKimi
Which led to the Mayan calandar or Tzolk'in. The words in the second line correspond with days on said calandar, yielding the number sequence:
1 57 1 51 51 7 5 1 6 5 5 6 51 51 56
These numbers were then converted into Mayan numbers and then converted into morse code.
1, . 5, - 6, .- 7, ..-
. -..- . -.-. ..- - . .- - - .- -.-. -.-
Which translated to EXECUTEATTACK.
https://lumerico.mx/EXECUTEATTACK/index.html provided this message:
Ha llegado el momento. Esos correos expuestos la verdad sobre Portero, iniciado la revuelta, y hemos convencido a la gente de México a apoyar nuestra causa. Ahora es el momento para el golpe. Convertiremos su preciada inauguración el 1 de noviembre en un gran movimiento en su contra. Necesito que hagan una cosa:

Consigan acceso al correo del jefa de seguridad y busquen alguna forma de ayudarme en el ataque. Es posible que lo vean contactando a Portero pronto. He cambiado su contraseña a: d0r*NuLw9

The moment has come. These emails exposed the truth about Portero, initiated the revolt, and have convinced people of Mexico to support our cause. Now is the time to strike. Convert your precious inauguration on November 1 in a large movement against it. I need you to do one thing:

Get access to the email security chief and seek some form of help in the attack. You may see it by contacting Portero soon. I've changed your password: d0r*NuLw9

Credit to @Roque#4707 for noticing the change in Omnics.txt and @GenaBean#8300 for finding EXECUTEATTACK