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If you had a planet that was hollow in the center*, the entire hollow region would have zero gravity. You could have a thin-skinned planet with the entire interior an empty weightless void. I doubt any planets like this actually exist.
* Assuming radial symmetry. If you can represent the planet as concentric spherical shells then you're good.
A center of gravity is a single point and couldn't be expanded to fill a planet's interior, even if the space was only 1m^3
You're right but that was not the point. The comment just explained that at any point inside a hollow sphere gravity forces cancel out so that effectively there is no gravity.