Eh? I've not presented any hypothesis. But you presumably read this contamination/the had to move the base somewhere - I was just asking for some further detail? a Link etc..?
You have presented a hypothesis - the hypothesis that nothing has been moved from the Groom Lake base, building on the hypothesis that the contamination (for which there is some evidence) either never happened or did happen but did not affect any part of the base. So where are your links for that?
It boils down to this:
Based on the extremely limited evidence, which shows that some people who worked at the facility were exposed to hazardous materials and some of those hazardous materials are known, I think it's plausible that some contamination of part of the site occured and some degree of scaling down of the work there happened. I've not claimed to know that happened. I've just expressed an opinion that it's plausible. I think it's plausible. You don't. Neither of us can provide proof because of the scarcity of evidence. There is evidence of contamination, but that's all. The extent of contamination is a secret. What the contaminants are is a secret. Which is why I think it's plausible that the contamination was enough to prompt a reduced use of the facility.