WORKAROUND
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It is possible to scale a table as a complete object within PowerPoint by using either the ScaleWidth or ScaleHeight methods.
The following macro will scale a table by 75% without converting the table into AutoShapes.
NOTE: A table must be selected or else this macro will return an error. If there is too much text for the table to resize properly, the width of the table will be scaled properly. The text will wrap to the new width, and the height will increase to accommodate the wrapped text.
Sub ScaleTable()
With ActiveWindow.Selection.ShapeRange
.ScaleWidth 0.75, msoFalse, msoScaleFromTopLeft
.ScaleHeight 0.75, msoFalse, msoScaleFromTopLeft
End With
End Sub