You don't need to implement full USB for USB power delivery. USB's data transmission is not used in it at all.
Detection of power delivery plugs is mechanical for standard A connectors (their male standard-A connectors are 1.3 mm longer so they could be inserted deeper in female power delivery connectors than conventional connectors so metallic shield connects detection pins) and based on detecting resistors and capacitors between ID pin and ground and power pins for other connectors.
For voltage negotiation new simplified bus and protocol was invented; it uses high frequency transmission on the same pin as power.
Detection of power delivery plugs is mechanical for standard A connectors (their male standard-A connectors are 1.3 mm longer so they could be inserted deeper in female power delivery connectors than conventional connectors so metallic shield connects detection pins) and based on detecting resistors and capacitors between ID pin and ground and power pins for other connectors.
For voltage negotiation new simplified bus and protocol was invented; it uses high frequency transmission on the same pin as power.