We can confirm that the Thunderbolt 4 Dock does indeed come with its own 135W power supply.
The hub itself uses about 39W of power in order to power itself. The remaining 96W are reserved to charge the host device the dock has been connected to.
We hope this information has been able to provide a bit of clarification and guidance for you.
Please feel free to reach out to us if you were to have any further inquiries or concerns we can assist you with.