That's bullshit PR/marketing to justify the contract they gave him. It's possible he makes a big jump as a passer just like anything is theoretically possible but ultimately it's quite unlikely.
Everything about Hurts last year was heavily schemed and slanted towards what he did well, primarily as a runner and building pass concepts off of that.
They can still pull that off this year because they still have arguably the best OL in the league but physically I don't think he'll be able to stay healthy carrying the ball 10-15 times a game.
And where it'll get really interesting is if they lose any of their OL for a significant period of time, and of course when Kelce inevitably retires after next year.