dunno if its been debunked it just states its more then 50% with nothing to back it up since it doesnt link the study.
also its hard to track the unreported number coz they go unreported which is the main flaw with most of these(like finiding hout how many unreported robberies there are for instance).
went tru their main site most of their info comes from surveys but still has problems but atleast its alot more trustworthy then the rainn study