Okay, they're referring to this connector:This is a connector used specifically for the front panel USB-C connection, and the motherboard you chose doesn't have this specific connector. The only thing this will affect is that USB-C port on the top of the case. The other front panel connectors for the power button, USB Type-A and audio jack will all be able to plug into the motherboard you selected on that build. So if you don't have any use for a USB-C port, then it's not a big concern. The closest priced board to the ASUS X570-P I found with the USB-C front panel header is the X570 Aorus Elite, with the next one up being the X570-Pro Prime.
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