(Author of the article here). I think you underestimate the power of a good (long) password. Check this out: https://www.grc.com/haystack.htm

That site lets you enter a password and see how long it would take to crack using a brute-force scenario. Assange's 58-character password would apparently take "16.40 million trillion trillion trillion trillion trillion trillion trillion centuries", assuming one hundred trillion guesses per second (which is far more computing power than is presently available to anybody in the world).

Cryptography relies on strong passwords. Assuming that the password wasn't deliberately given out, a 58-character password is going to be secure for a very very long time.