They didn’t corroborate the testimony. Nobody at buzzfeed has seen the supposed evidence. Buzzfeed isn’t asking us to trust them (which would already be dubious

They didn’t corroborate the testimony. Nobody at buzzfeed has seen the supposed evidence. Buzzfeed isn’t asking us to trust them (which would already be dubious), they’re asking us to trust some unnamed source (and trust it over Mueller’s refutation of the story). That’s tabloid level rumour printing.