My version, quickly, would be that he envisaged "points" that were abstractions. Whence "logical space" as came in first around 1900 (long discussion) as implied by Boolean algebra, which he also anticipated. Also "extensionality", still a scary concept for mathematics even post-Grothendieck. Sadly MO is hardly the place: the recent book by Daniel Garber on Leibniz makes the good point that his thought is a moving target, often distorted by later authors.
Charles Matthews
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