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TUSB319EVM: Vbus discharge circuit

Part Number: TUSB319EVM

I am using the TUSB319EVM module and have a question about the Vbus discharge circuit.  I am specifically looking at Figure 1 on the TUSB319EVM user manual which is the same as Figure 2 on the TUBS319-Q1 datasheet. 

Based on the figure and the datasheet ID goes LOW when a cable is attached.  When ID goes low the p-channel FET turns on an the VBUS is discharged through the 1K resistor.  When the cable is unplugged ID goes HIGH.  When ID goes HIGH the p-channel FET turn off. 

I would have though this should be the opposite?  Should the be an n-channel FET instead of a p-channel?  Is the goal of the discharge circuit to discharge the voltage on VBus when a device is attached or when the device is unplugged?  

Thank you.