Hello Chris san,
Thank you for the information.
I understand that 1-2uA is reference data(not guaranteed data) due to there is not the leakage current at FB pin .
And Since FB pin leakage curent is 1-2uA and 5V fixed output, internal divider is about 5MΩ - 2.5MΩ.
Is my understanding correct ?
Best Regards,
Ryuji Asaka