Can this cable support 4K video output?

Yes, this cable enables full 4K 60Hz video output.

What is the maximum data transfer speed of the StarTech Thunderbolt 3 Cable?

The StarTech Thunderbolt 3 Cable provides a maximum data transfer speed of 20Gbps.

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StarTech TBLT3MM1M Thunderbolt 3 Cable - 3 ft. / 1m - 4K 60 Hz - 20Gbps - USB C to USB C Cable - Thunderbolt 3 USB Type C Charger Cable - 1 pack

Provide twice the data transfer speed of any other cable type and enable full 4K 60Hz video and power your devices with a single cable
1m Thunderbolt 3 Cable / 1-meter Thunderbolt 3 USB Type-C Cable / 1 m Thunderbolt 3 20Gbps USB-C Cable / Thunderbolt USBC & DisplayPort Compatible
Connect to any Thunderbolt display or data device
Daisy chain up to 6 Thunderbolt devices
Peer-to-peer 10Gb networking
Connect charge & sync USB 3.1 devices