???
Your comment had me struggling to determine how one could store WhatsApp messages on iCloud. (From a Blackberry no less.)
But then I followed your link. I don't think that article was about Cohen. You may want to change your post.
On an equally important note, why is it that people out there assume that ANY form of electronic communication is impervious from government surveillance? The reality is that if a three letter agency is after you, it's probably unwise to be using WhatsApp and Signal in an incriminating fashion. (Or anything else for that matter.)
It's like locking your physical spaces. Yeah, you should go ahead and lock your house or office and turn on the alarm system while you're gone...
but you should also go ahead and assume that those three letter agencies planted surveillance devices in that house or office even in the face of your security measures.