> The USB standard only allows 7.5W (5V @ 1.5A) of power. By negotiating over the data lines, the supplier and consumer can agree to higher amperage and voltage (up to 100W in USB3, 240W in USB3.1) - but you need data lines for this feature.

Per the USB 3.1 power delivery spec [0] all communications related to power delivery occurs over the CC wire (with roles chosen according to Vconn), the data wires are not involved.

[0] https://www.usb.org/sites/default/files/USB%20PD%20R3.1%20V1...