I have no clue how they actually could refer to confidentiality, who is protected by this confidentiality? It is you who is interviewed there not them, it's about your confidential issues, not theirs, just an assumption. If you choose to spread the recording containing your confidential sins, you may do it, it's not their business at all.
I know, I know, they don't see it that way, but it's very illogical.
CP