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Backward compatible, in this instance, simply means that if you plug a USB2 device into a USB3 socket you can usually expect it to work
Oh... usually... except when it doesn't work which is far more often than you think. If the cable doesn't list 480Mbps/480KB/s in it's specs, it won't happen.

A USB 3 cable must also include the cabling for USB 2 for most interfaces and all keyboards to work—only the ground is common to both. Many don't because they are separate protocols and you not thinking it important doesn't mean it isn't. USB 3.2 gen 2 often won't and gen 2+2 almost never does. Old 3.1 (was 3.0) might not while newer ones do. Normally, one checks the USB-B plug but that is not a certain indicator.

I have helped too many people with these problems by recommending what cables to buy to avoid the USB 3 mess. How many times do people ask for help when things work? Right, they don't.

Again, Yamaha and other manufacturers recommend USB Print cables because they only support USB 2/1.1. You can get them in any of the standard configurations including USB-C to USB-C.

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