1. "an exercise in" is a common English idiom. If "X is an exercise in Y" it means that Y was the real outcome or nature of X.
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akdomThere seems a slight difference between this example and the examples you provided. In this example, the implied ul
(webster)
exercise:
4 : a performance or activity having a strongly marked secondary or ulterior aspect
<party politics has always been an exercise in compromise — H. S. Ashmore>