Yes in the configuration given in App Note 5775 the EN/UVLO voltages are still 1.218V (nominal) to enable, and 1.135V (nominal) to disable. However, the manner in which the circuit is set up in this configuration means that once powered up, in order for the chip to shutdown ( for the voltage to drop below 1.135V on the UVLO pin), Vin must drop by greater than absolute value of the output voltage. See 'Start Voltage' paragraph page 2 of App Note.
As the output voltage becomes more negative, the voltage differential between Vin and Vout increases, thus increasing the voltage across R1 and hence increasing the voltage at the EN/UVLO pin. This means that the pin is always enabled until the Vin drops enough in compensation for the differential created by the negative output voltage.