Samotny USB-C konektor neznamena vobec nic, len USB.
Ak dal vyrobca na dosku extra napr. tento chip https://ark.intel.com/products/94031/Intel-JHL6540-Thunderbolt-3-Controller tak mas na tom v navode napisene hura tralala toto je thunderbolt3 port my sme svetovi a to funguje potom ako bud USB, alebo PCIe, alebo DP. HDMI priamo nemusi, zavisi to asi aj od chipsetu ale tie prevodniky na HDMI su asi aktivne takze fungovat by mali. Pasivny (nejaky extremne lacny) prevodnik ist nemusi (moze).
Akoze je dost mozne ze u mnohych USB-C portov pojde aj prevodnik na HDMI, len pisem ze to proste nemusi byt nutne vzdy podporovane len preto ze to je USB-C konektor. Ten konektor je povinne len USB, vsetko ostatne je nepovinne.
(viz wikipedia Alternate Modes are optional; USB-C features and devices are not required to support any specific Alternate Mode. The USB Implementers Forum is working with its Alternate Mode partners to make sure that ports are properly labelled with respective logos)