Mine sure isn't. It's hand written and in a sealed envelope in my fire safe.
However it was provided to me via the internet, and to use it, the pass phrase must be entered via the internet. Two possible points of interception.
It's sorta like breaking into an Iphone. Nobody can seem to do it until a hacker does it. I'm sure the NSA and CIA can do it before breakfast but they don't want you to know that can get everything on your phone. If one guy can do it, a hundred guys can do it.
BTW, this is why voting machines can't be on the internet.