@scgaskill I am sorry you've been getting some wrong information from the guy at the service center. I am genuinely trying to help you, and so I am telling you that you need to listen to folks like
@MP3Mike and myself who have been in this stuff for a decade. We can't necessarily know exactly how this new CCS retrofit works with it, as that is new, but the old part we do know. The technician you've been talking with is also probably new--most Tesla employees have only been there a few years.
Here is the old stuff that we can give you real accurate information on.
No, that is not true. ALL of those old S60 cars DO have all of the hardware necessary in them already. There is nothing that physically needs to be added. It is literally just a software configuration switch. There was never any danger to you or your car. Here's the reason for the price difference:
It was named CHAdeMO capability, because that's the only other alternative that existed, but that $2500 option is more generically for "Other DC fast charging other than Superchargers". It just enables that capability.
The Supercharger option included the CHAdeMO capability PLUS Superchargers too. The reason the $12,000 cost for Supercharging is so much more is that Supercharging was all or nothing back then. They didn't have pay as you go. Turning it on was adding the permanent lifetime free unlimited use, so it had a very expensive price tag that was paying for a lot of usage. The S85's came with that, which was part of that larger price difference above the S60. I don't even know how that would work now, since they have been trying to get rid of the permanent free Supercharging users. Would they activate that? Or do they have some cheaper thing they could do to enable pay-go Supercharging?
So thing we know, and thing we don't:
1. Since your car doesn't have either of the DC fast charging settings enabled, yes, that makes sense why just the CCS capability isn't a standalone that can work.
2. Enabling just the "other DC charging" I thought might also let it work with the CCS upgrade, but maybe there's some real technical reason why it does need to have the actual Supercharger setting turned on too.