Officially. Even so, I still don't call that "abolished" when you still have slaves. Abolished is zero slaves.
I have discussed this point about Washington before. I think he simply never challenged Pennsylvania's law because he didn't want to ruffle feathers in the early days of the Republic, but he clearly had no respect for it, and acted as though he had a right to keep slaves in that state.
Washington gradually came to believe that slavery was not only wrong, but a bad idea. His writings on the subject are very interesting.
he clearly had no respect for it, and acted as though he had a right to keep slaves in that state
Washington complied with the law of state of Pennsylvania. What he believed is immaterial. His actions complied with the Law in the State of Pennsylvania.