Customer understand, that neither PFM mode nor AutoFoldback occurs when used in FPWM mode.
Is it correct?
They are worried about the meanig of "essentially" word in the datasheet.
When the device is placed in forced PWM mode (FPWM), the switching frequency remains constant as programmed by the RT pin for all load conditions. This mode essentially turns off the light-load PFM frequency foldback mode detailed in Section 8.4.2. See Section 8.3.1 and Section 126.96.36.199 for details.