Incorrect. 
The link you use is not the constitution. It's only the Permanent Fund Corporations public information website. 
Only the top paragraph shows the constitutional article you cited which correctly states that at least 25% of Alaskas royalty mineral wealth must be deposited into the fund for income producing investments. ( Of which up to ALL of the earnings  could be put in the general fund if desired by the peoples legislature and governor) 
The rest of the page explained the LEGISLATED law articles regarding the management of the PF earnings, the reserve and the PFD fund used for its distribution. 
None of this Is mandated by the Constitution. 
Some politians such as Weilechowski want to changes this(perhaps just for populist reasons). But chances are highly unlikely for success with a peoples vote required as well as legislative super majority approval.