The blurb ain't canon any more than DoE's or NJO's or any number of other massively hyperbolic publisher statements.
But let's all instantly change that decades long standing status quo as soon as it indicates anything remotely resembling your PT > everything else narrative. Amirite?
But yes, a massively pre-prime Kun being capable of telekinetically lifting a Sith Battleship through a temple, controlling millions of minds, physically tanking telekinesis from beings so powerful they can survive supernova waves and being massively more powerful than a more powerful version of DE Luke and being vastly more powerful than Vader? Yeh, pretty indisputable.