The API mentioned, does not concern the grid rows height, when columns group view definition is used. In fact, I don't think it was ever taken into consideration (I checked with a couple older versions).
To set all rows height, you can iterate the rows and set each RowInfo's RowHeight property as shown in my previous post in this thread.
Other means to size the layout are the RowSpan property of a group:
and the MinHeight property of a row in the column layout:
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