Softex For freelancer ?

Read in this article that freelancer working as software developers have to file for Softex also ? is this correct ?

https://www.reddit.com/r/IndiaTax/comments/1e2gy7e/guide_to_freelancers_exporting_itites_gst_softex/

I thought need to file only gst and income tax , as i am freelancer working as software developer for international and indian clients