I do get your point, now let's put this in context:
The product asked for was HMB. There are very few companies who sell pure HMB products, and even fewer who do so at a reasonable price. You'll find that HMB is patented to one company: Iowa State University.
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All raws for HMB must come from this place, so we could more than likely assume that either all of their HMB is flawed, or that purity is decent and all manufacturers producing HMB products use their HMB (as by US patent law). I would think this would mean that we can safely say the HMB is probably pure, but the question remains of the rest of the product (fillers, binders, so on). Even though the trace amounts of PH's found in other products in the study above (.01 to 190 um/m) would certainly not affect humans endocrine system in any measurable way other than possibly a false positive, I see your ideals a a natural would then prevent you from buying Ultimate Nutrition. Well, lucky day, Wojo doesn't seem to care much about that, but I think it's safe bet to say he's at least getting the HMB if nothing else.