What do "recently" and "advisable" mean here? Private Bible reading has been indulgenced since the 1920's at least. It's hard for the Church to make it more "advisable" than that.
That's a considerable change for the RCC who previously didn't want their members to read the Scriptures for themselves.
Considering we've had the Scriptures for a pretty good while, the shift in the 1920s is fairly recent for the Roman Catholic.