I think that most arguments that use zombies can actually be rephrased in a zombie-free way, so that these arguments can be set aside if one prefers; but zombies at least provide a vivid and provocative illustration.
He does believe in the logical possibility of zombies (though I can’t understand why) but does not feel that they are necessary to his position. You can certainly read his papers if you want to know anything more specific.
In fairness to Chalmers, from here:
He does believe in the logical possibility of zombies (though I can’t understand why) but does not feel that they are necessary to his position. You can certainly read his papers if you want to know anything more specific.