Does the highlighted sentence imply that "they do not ask any question about the actual nature and outcome of..."?
Both he and they have been rightly taken to task for developing a theory and practice that prioritises too vaguely or, indeed, ‘mistakenly’ the notions of continuous open-endedness and viewer participation, at the expense of posing searching questions relating to the actual nature and outcome of the dialogical relations they would seek in such encounters between spectator, location and work.
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— Doctor D
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Not so much that "they do not ask" but that "they instead should ask." Apparently the writer believes that the most important questions are those "searching questions etc."