If he’s not their employee they don’t have to issue a public denial to protect themselves from lawsuits. Anyone who files one against them is just going to run up against the brick wall of the fact that he didn’t work for them. Which might open them up to a lawsuit filed by Pinkerton.
Pinkerton now says Dolloff was a subcontractor.
https://nypost.com/2020/10/12/denver-shooter-was-a-sub-contractor-not-employee-pinkerton/
This may lessen, but not eliminate, their liability exposure.