casistica significa trovare una norma/caratteristica comune ad un certo gruppo di cose/eventi osservati VD treccani sotto
typology è the study of a particular group of people or things that share similar characteristics and form a smaller division of a larger set vd cambrige sotto

I always have problems with "casistica" and here "segmentata" isn't really easy to understand either. I think you have to step back, figure out what they are trying to say, and imagine how someone would say it in English. Maybe here the idea is that the known examples of sculptures form a discontinuous record (and that makes it hard to trace a linear art historical progression). Not sure!

Cases or patterns, but cases probably better, examples that don't conform with the norm, but appear repeatedly in a series of occurrences or patterns. In this case probably also explicitly referring to fragmented art. But the key is the reference to Kopienkritik which apparently has become a concept that refers to something that involves a kind of rearrangement of existing artwork or literature by extension to create a new piece of art or idea. Alternatively, just a series.

Casuistry is reasoning which is misleading or oversubtle. It's divided into segments or sections.
"Casuistry is also the determination of right and wrong in questions of conduct or conscience by analyzing cases that exhibit general ethical rules."

(IT: La casistica è il ragionamento che ci inganna o è troppo sottile. E divisa in sezioni o segmenti. Anche è la determinazione del giusto o dello spagliato in questioni di condotta o di coscienza analizzando casi che mostrano regole etiche generali.)

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Note added at 4 days (2021-10-18 19:10:21 GMT)
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https://www.deepl.com/es/translator#en/it/segmented casuistry

https://www.thefreedictionary.com/casuistry