The paper draws two distinct inferences from these nulls: (a) the terrestrial ultraheavy-isotope nulls further reduce the likelihood that strange matter is stable in bulk at zero pressure (Blackman-Jaffe); (b) the accelerator nulls, while not by themselves decisive for RHIC (insufficient luminosity to bound negative-strangelet production there), anchor the production-model fits (coalescence penalty factors) used to argue production is hopeless. A stable light strangelet would masquerade chemically as an ultraheavy isotope of a normal element (e.g. A ≈ 100 with Z = 7 behaving as 100-N nitrogen), which is what the matter searches exploit.