(By the way, please note that DS 3.5 is not an official version yet; fixing the topic title )
Since DS 3.4, in headless build, a new option has to be provided on the command line to specify the module to be used for the project; e.g.:
-module SL808XT
But it’s true that the documentation was not updated on this particular point; fixing it ASAP for the (real) DS 3.5 release.