There were certainly dealer-add ons and port add ons for the spoiler, but I remember when I was looking at the factory options for either a 2000 or maybe a 2001 Camry, there was a "sport" package available from the factory that included the spoiler, alloy wheels, and the round fog lights. That was not a package that was very popular- and very few of the Camrys that were sold in my area at the time came with it. I think it was available with the CE and/or LE trim- because the XLE already came with alloy wheels. Maybe that's the rear spoiler that's in the picture- and the more common rounded one was the port-installed or the dealer-installed spoiler.
Just a theory.
Personally, all of the OEM spoilers that I've seen for the 97-01 Camry have all been rounded.