Comment by AceJohnny2

Apple has denied this.

From their support page https://support.apple.com/en-us/HT213839

> The USB-C cable that comes with your iPhone supports charging and USB 2 speeds. If you want to use a USB 3 device, use a compliant USB 3 cable that supports 10Gbit/s.

Note that this is only the 15 Pro. The "vanilla" 15 uses last year's A16 SoC and doesn't have a USB 3.x-capable PHY.