I only use the documentation and demos of White himself. This documentation is part of the source code of White.
White is a Wrapper of UIAutomation and most White functions are based on UIAutomation.
The Loop ( I have corrected a copy paste error there)
the first line gets all cells from a row as AutomationElementCollection.
the second line is the constructor of ListViewCells which is a collection with all cells of a row.
the last line added this to a list.
The list contains all cells of all Rows in the same order.