“He is generous, courageous, and eloquent” lists three virtues, but it provides no apparent move toward criticism or qualification. It does not automatically constitute emphatic praise in the guise of blame.
“He is generous, but his courage is extraordinary” can create the relevant effect if the contrasting particle makes the hearer anticipate a limitation and then presents an additional virtue.
Classify the figure through the opening judgment, the expectation created by its connector, and the final increase in praise—not merely the number of positive adjectives.