If I use a report form to create a PDF that requires 2 pages at 100%, and then do it again with the scale set for 50%, I get a one page PDF that looks exactly like page 1 of the two page PDF. The scale factor didn't change at all. I just get half the pages.
This is true whether I use Page Setup to set it for 50% and then choose Print from the File menu, or whether I use
printtopdf "file name.pdf", "scale", 0.5 in a procedure.