High/ Low level output voltage in gate driver datasheet
No, you should replace R1 with a constant current source of 100mA. If the direction of current is toward ground then use a value of 100mA for the \$V_{OH}\$ test and -100mA for the \$V_{OL}\$ test.

Your calculation of Ron from the datasheet parameters is not likely to be very close to the actual Rds in the simulation, and remember that this resistance is not a simple constant value.

The basic meaning of the \$V_{OL}\$ specification is: How low (in voltage) can the driver pull the output pin while sinking 100mA? The maximum value given is the worst-case, or highest possible voltage that can appear when the driver is trying to pull the output pin low. Likewise, the \$V_{OH}\$ specification tells you how high can the driver pull the output pin while sourcing 100mA. However, this datasheet doesn't specify the actual voltage for \$V_{OH}\$ but rather the difference between the actual output voltage and its ideal value (either \$V_{DD}\$ or \$V_{HB}\$).