I think he made an updated version, or at least made a second volume.
My trouble with Portrias was his tendency to look at anime with rose colored glasses. In his Anime Essentials he said some things that was rather distorted, like advising parents on Tenchi Muyo, the OVA: "Warning: Some characters fight to save others."
... well that and the fact that the females were naked in most of the episodes
Though in fairness he was one of the better writers out there. Though that's more an indictment of the other writers than praise of him