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Hello,
Hi Mike,
I believe the wording is confusing, it looks like they mean the total value of the FB node should be targeted at 250k. The range can be modified, the concern is stability, by changing the resistance, you modify the RC network for ac stability performance. the CFB will need to be adjusted if significant deviations are made in the total resistance of the FB resistors.
Consequences for your circuit, by increasing the FB network resistors larger, you cause the leakage current of IFB to cause a larger voltage deviation on VOUT. By being below you cause the current going through the FB node to increase decreasing the allowable current for IOUT and increasing the leakage current the devices circuit consumes.
Additionally both will modify the necessary CFB necessary
Regards,
John