The announcement is totally explicit that data will not be retained.
That sentence is obviously explaining what happens if you try to query outside the retention window: no data will be returned for data before the retention window. That needs to be stated, because there are other possible ways it could work, like the entire operation failing with an error if any portion of the query window is outside the retention window.
That sentence is obviously explaining what happens if you try to query outside the retention window: no data will be returned for data before the retention window. That needs to be stated, because there are other possible ways it could work, like the entire operation failing with an error if any portion of the query window is outside the retention window.