What they claimed is almost irellevant - the device bears USB-C logo and has a USB-C port - so plugging a USB-C device into that port should in the worst possible case result in a system message "sorry, this device is not supported", not brick the device! There's a reason why you can't use a USB-A cable in your device to carry 220V - because someone will plug it into a normal USB-A socket and burn their computer down. If both sides of the connection have the official USB logo, then connecting them together should never result in either device becoming damaged.