I'll admit the error, I used the wrong term "better". I should have said "higher".
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Cabin Assignment: You are currently booked in a guarantee cabin. This means that the cruise line guarantees you will be berthed in at least the cabin category you purchased or higher.
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E2 is a 'higher' category than E3.
Digging into this further, 6169 is above The Club, which is host to the late night DJ dance club. If I have an opportunity to correct this error by Celebrity, it's likely the new cabin will not be above a late night bass booming public space.