Does it have zero gravity

No

I am not familiar with this term. They only have trampoline for bigger kids. They to not have any devices that you harness into for jumping and flipping.

Bouncing on a trampoline lets the jumper experience the interplay between weightlessness and large forces on the body, as the motion changes between free fall and large acceleration in contact with the trampoline bed. It might not be zero gravity, but it is very interesting to experience the physics of jumping on a trampoline.

Lol no

Definitely not!