Given Taylor had that bad of a reaction just by touching the entrance of the site, I can totally understand why Dragon isn’t thrilled to actually go closer to that.
So much so that scientist Travis Taylor got radiation burns merely by opening a hatch that led underground.
Regardless of whether or not Skinwalker Ranch has evidence of aliens, it is more or less confirmed it has a solid amount of radiation.
In Dragon’s defense, he’s only doing what he’s been hired to do.