I've been looking into getting an RVC myself for our Superb at some point, so my understanding is as follows.
Since the Columbus system and the Park Assist are effectively VW components, they have OPS implemented. However, the Skoda version has the functionality disabled in the firmware. It is possible to alter the firmware configuration to re-enable OPS - this is what was done using VCDS.
However, flashing the Columbus firmware would have the side-effect of resetting firmware configurations back to factory defaults. The OPS setting is unlikely to be a user setting, it's likely to be hardcoded into the firmware configuration itself. It's very likely OPS can be re-enabled using VCDS again - unless they've crippled the OPS functionality in the firmware itself further.
So, chances are that every Columbus firmware update is going to disable OPS, or parts of OPS and you'll have to get that reconfigured. It might be worthwhile investing in a copy of VCDS and the cable (I'm toying with the idea myself but... being a programmer and having stuffed up my phone a few times with ROM updates gone wrong... I'm not sure if I'm prepared to brick my car... a very expensive and sizeable brick to own)
It's highly unlikely that the Skoda dealerships know how to get OPS working unless you get a passionate Skoda mechanic who dabbles into the black art of VCDS... and they'd probably be venturing outside of authorised VAG territory.
Of course, there is the possibility that the RVC is faulty too, but unfortunately there's no such thing as a genuine RVC for Skoda... I guess, if you can get your hands on a VW RVC, it should work flawlessly...
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