TUSB8041: GRSTz with just putting capacitance case

Part Number:TUSB8041

Hello

TUSB8041 datasheet says that

“The 1 μF capacitor on the GRSTz pin can only be used if the VDD11 supply is stable before the VDD33 supply.” on P34.

I think GRSTz is just active low rest input pin. Why does just putting capacitance on this pin work as reset signal?

And why does it work only VDD33 supply first case?

Regards,

oba