Hello,
I can confirm S32 Design Studio for Power (S32 Design Studio IDE|NXP ) is free-of-charge product based on open
source GCC/Eclipse environment.
All you have to do is to Activate the product (online or offline method).
You can also check a release announcement for more installation related details (https://community.nxp.com/docs/DOC-335338 )
The only exception are 3-rd party plug-ins (premium S32DS components) by IAR, Lauterbach, GHS... these require to have a 3-rd party license.
Hope it helps.
Stan