The above statement is not entirely accurate, as computational uses the platform of theories to their advantage. The two things are interlinked. The simulations are built and performed using the underlying theories to create the approaches’ basis. The approach of both simulations and theory working hand in hand allows for a better image to be created for the scientist and can be used as a significant advantage.
Well, every experiment unconsciously follows specific laws that are or will be provided by the physicist but does it make that experiment theoretical? Yes, they are intermixed but they have their own identity just like watermelon seeds in watermelon. Though a single body it contains both pulp and seeds.
(P.S-Sorry for my poor example:)