The resource pages and sites that are developed and run by the players are just that. Developed by players, run by players. They are not official, nor are they maintained by the RotJ staff.
If there is a discrepancy with the content of the player-run site, whether the accuracy or currency of information, take it up with the player who developed the site.
Do old logins still work.
Depends the age. Most old website logins still work, they were ported over to the new website. Game characters do eventually get purged depending on age and level.