I have CMW16GX4M2C3200C16 the Vengeance RGB PRO 3200MHz C16 with the ROG strix x570-E gaming. In stock it ran at 2133 with C22 not the advertised 3200. I had to enable the XMP in the bios with one click and now it runs as advertised:)
I heard, don't quote me on this one, that the advertised speed/timing is the one that the manufacturer deemed stable after testing. It doesn't mean it can not go any higher but that is the speed that they guarantee to be stable.