Another tweet confirms how the Magic Dock works:
The Magic Dock can accommodate the existing cable:
Or if Tesla wants, it can also accommodate CCS cable:
As discussed before, the interchangeability is for Tesla, not for an average driver.
For example, if Tesla decides to increase the CCS from 50% to 100%, it can use the same dock, but only need to replace it with the CCS cable.
The reverse is true: If there's a conflict, Tesla could convert the site from 50% CCS to 100% Tesla by switching the cable and leave the dock alone.