How could zooming be considered filtering?
1) Zooming is a filter on the range of values of the row and column fields of a scatterplot.
2) Zooming a scatterplot happens when you drag a new field to the the size shelf.
3) Zooming is not in any way filtering.
4) Zooming a scatterplot happens when you drag a new field to the filter shelf and select a strict subset of the field's values.