I was asking myself the same question about whether there is duplication in the site locations. I believe that there is based on looking at my own area. I see several reports from nearby zip codes but none of them locate the proposed data center at the correct site even though I figured out where it was supposed to end up by doing a minimal level of study of the area. I didn't see a link to the articles that a couple of the site locations referenced so it isn't possible to determine whether three people saw and reported the same article without providing a link or whether there is are fact three different data center locations proposed or in the works.

I believe clusters of dots with no reference links probably are duplicates in many cases. The ones that are ground-truth are the ones where site names and owners are listed or where a supporting article is linked.