Did you look at the part number they sent me ?” Part number for a 203mm vented disc in black is HBSP4342036VN “I've still no idea what you are confused about.
Regardless, plenty of other manufacturers to choose from.
If those are 3.4 mm thick then what vented rotors are 1.8 or even 2.0 thick. Honestly Hope is chaos ! But like you said there are others that can give a definitive answer to a simple question. Cheers