Your correct, the CD-ROM says nothing about this. However, if you're going to be removing the old top and using adhesive remover and a razor blade on the frame to remove the old adhesive, well, you don't want that crap in or on your car. Also, I just found it easier and safer to remove the frame. Two bolts on each side and the frame lifts right out.
This also gave me plenty of time to work on it. I just installed my hardtop while I had the frame out.
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino