It seems, as if they included every item, that is in game, besides event items. Just take a look at the Misc-Misc section. There is tons of consumables and other minor items, that noone would normally care to look up in a list.
As for including the MM-weapons in the lists... It is only logical. They exist, so they need to be included.
What I do not like about the list, is the way, that it clutters up the screen with up to 5 lines for 1 weapon (normal, MM, 3 other SAs) and that the SAs are not all in the same sequence (Red, Green, Blue...)
Also the Dual-Swords are missing the SAs. Consistently, they would be required to be listed twice... once for the normal version and once for the SA-version, when they were enchanted to +4.
I prefer my own list at the german site (http://downloads.onlinewelten.com/content/la2/items/items.php), which includes the same data, but in a more compact form (all SAs are visual as tooltip text), the required Soul Crystal level is included and the Dual-Swords are listed with SA, where I knew it...