You know a plant is shallow rooted when it is a member of the bromeliad family!
Fill the pot in with mulch and dead leaves. Then add a few inches of your good soil to the top. Water it thoroughly in, then plant the pineapple ad water again. Remember that all bromeliads sip water out of their cups on their leaves, not necessarily much from their roots, and hate having wet feet. Brom roots are mostly for stabilizing the plant upward so it can catch and hold rainwater an condensation.