The way they deal with older (less true) articles is control. The whole WT org is based on control (opposite to Jesus' example, love).
Control members by telling them not to talk to ex-members
Control members' time by constantly getting them to study new articles
Control members' time by constant meetings, field service ...
Control old articles by not publishing them (on the CD-ROM ... etc)
Label anyone who views old artices as an Apostate
Members have no time or capactiy for critical thinking, and therefore go along with whatever they're told.