Ordinary exception is analyzed as connected or disconnected according to context and construction. Here, however, the rhetorical question is how the expectation of a defect has been established and then overturned.
An imagined connected exception can evoke inclusion among faults; a disconnected reading brings out the different semantic category. These grammatical analyses should be distinguished from the intended rhetorical reinforcement.
The figure arises when exception-like wording adds force to praise instead of merely reporting an exclusion.