Sorry, but The Complete Star Wars Encyclopedia was written before Vitiate was introduced in Revan.
Originally posted by AncientPower'cept this is novel Vitiate. And we don't even know how much power he attained over that time. And even then, what difference does it make when he's "infinitely more powerful" than Nyriss?
Which he might well lose, unless fifty years is really that much of a deal in a power growth encompassing 1,100 years.
Need I remind everyone that his lightning was too much for Revan's tutaminis?