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Using ISTA you cannot select individual ECU or code only without programming. It usually updates the whole car. Its likely the vehicle was updated using ISTA or esys was used to code and change i-level

You can actually - you can select individual ecus under the advanced tab and choose programming and/or encoding

Exactly. I see the same crap over and over that you can't change these. If you haven't even tried to do that then at least read release notes. They frequently state "Assign HU-H3 control unit manually for programming in ISTA" or similar. How you are supposed to do that if ISTA+ would not allow you to???