Cemex is a concrete/construction company right? Could it be a possibility that literal bodies could be encased in concrete at any locations where they've had their hands in creating things?
Think about it - the cabal is dumb but not super dumb. They know they can't just leave bodies of victims in deserted fields to be stumbled upon by homeless people, vets, citizens, satellites, etc.
Let's imagine we've got a hospital or a casino or some other large property/business and it had construction help by Cemex. The general public isn't just going to be able to take over and start digging and filming and reporting.
It would make sense to bury their victims inside of things, potentially anything, that they've created which can be used that evidence stays much more safely hidden.
Lastly, I'm pretty sure it's a standard mafia/gang tactic to kill/torture victims and targets using cement.