Does this USB-C cable support Thunderbolt 3?

Yes, this USB-C cable supports Thunderbolt 3.

Questions & Answers: StarTech.com 3ft/1m USB-C Cable with USB-A Adapter Dongle, USB-C to C (10Gbps/PD), USB-A to C (5Gbps), 2-in-1 USB C Cable for Hybrid Dock

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StarTech.com 3ft/1m USB-C Cable with USB-A Adapter Dongle, USB-C to C (10Gbps/PD), USB-A to C (5Gbps), 2-in-1 USB C Cable for Hybrid Dock