The 20W statement is a complete fabrication. A PC consuming more than 400W is entirely possible and plausible, although probably not for FFXI.
And the point was that PCs themselves never took off quite as they did here, partly due to space issues. There's no denying that there are very simple and efficient ways around it. It's more of a mentality issue than a practical one, and sadly those aren't as easy to fix.
Obviously, but it's still a step that shows where the future is headed. If someone said PS2 limitations were removed with this update, that's clearly wrong, and sadly it wouldn't happen right away even after they stopped releasing on PS2 entirely, because it could still mean that merely newer components of the game are no longer bound by PS2 restrictions, but particularly things that are independent of the content (like inventory for example) may never be improved due to that.