It does define the standard
Annex Part I - 2. In so far as they are capable of being recharged by means of wired charging, the categories or classes of radio equipment referred to in point 1 of this Part shall: 2.1. be equipped with the USB Type-C receptacle, as described in the standard EN IEC 62680-1-3:2021










Regarding printers: the yellow tracking dots are made exclusively by colour laser printers. If you have any inkjet printer or a pure black & white laser printer, there are no yellow dots. Other tracking methods might be possible, but this is the only confirmed method.
https://en.wikipedia.org/wiki/Printer_tracking_dots