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"All thirteen" lives of the Doctor are referenced, and we then see new and archive footage of the twelve known Doctors (1-to-11, plus War), and an uncredited cameo by Peter Capaldi. So, Capaldi is playing a Doctor, and one of the first thirteen lives. So that means he's either the Twelfth Doctor, or a version of the Doctor who is not usually acknowledged (like the War Doctor). Since the first eleven regenerations are accounted for now, that would push him post-Eleven.
I see no reason to dispute, based on The Day of the Doctor dialogue, that Peter Capaldi is playing the Twelfth Doctor.