Why do VW have 2 or 3 different acronyms for the same system depending on where you are, especially 2 different systems that can have the same (ACC) acronym???
I reckon they changed the name at some point and this caused confusion with the regional VW people, like VWUK, so that not all references were changed or something or some people didn't get the message.
My theory is they called it ACC, then later realised they already called the cruise control ACC so switched it to DCC. Separately the radar for the cruise was called ADC, which probably wouldn't have been much of an issue without the DCC/ACC confusion because now we can mistakenly think the cruise is called ADC and assume all ACC references are to what is actually called DCC.
Could be this is largely due to translations from German to English. Perhaps these acronyms aren't so confusing in German! They may not have 'planned' ahead in English although they probably should have.