Can you elaborate on what you mean by "hide" any component under ReportDefinition. The ReportDefinition is where you define the XML document that will be created that is later used by ReportDisplay to output the data for a PDF report, Excel utilizes the ReportDefinition. Just because you have an entity(element/attribute/group) in a ReportDefinition doesn't mean it will be utilized in the ReportDisplay.
You might also find some relief by querying %Dictionary.MethodDefinition WHERE SQLProc=1 or %Dictionary.QueryDefinition. If it's a really old version you might look in %Library schema.
This article refers to https://github.com/es-comunidad-intersystems/IRIS-in-Astronomy but when I tried going there you get a 404 Page not found. Maybe the repo is not public?
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