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Barozi said:
However this is just an estimation from the author based on "software dollars" right ?
Or does he really have full informations about those NPD April 2010 LTD sales ?

No, he gets some additional information from NPD directly.  Everything he puts out is sourced from publicly available information (via NPD, Pachter, etc) or from NPD upon request.  He always tries to get a bit of extra info each month.