that looks like it is disproof and not debunking
debunk: to expose or excoriate (a claim, assertion, sentiment, etc.) as being pretentious, false, or exaggerated.
Random House Unabridged Dictionary: Second Edition
Robbins does, in fact, "expose" as false the Lazar inventions regarding Element 115.
"Debunk" is a better word here than "disprove." Someone might sincerely advance a theory about the properties of a substance that is later "disproved," i.e., shown to be mistaken. But in this case, Lazar's claims about Element 115 are an integral part of the structure of his great tower of lies, and not merely erroneous notions -- so "debunk" is the better word.