Perhaps it is a bit confusing to have two boxes saying basically the same thing? Would it be better to remove the first box, promote the second box to a Remember box (with the red border for emphasis), and perhaps replace the its first sentence with the stronger worded first sectence of the first box? It would look line this:
|If you don't want to have Akonadi running on your system, you can not use any of the Akonadi-enabled applications. Such applications will start Akonadi, whenever they need its services even if you have disabled it. Remember to check Plasma widgets as well — the Digital Clock widget in the default panel, for instance uses Akonadi to (optionally) display calendar events and this is enabled in its settings by default. You must remove any widgets that may start it from your start-up, if you wish Akonadi to remain disabled.|
This way, we would first have the recipe for disabling Akonadi, then the warning that running any Akonadi-enabled app will start Akonadi.