Why
From the article:
"Data collected includes the user's name, mobile number, *age, gender, and profession*, as well as which users they have been in contact with, for how long, and where they were." (emphasis added)
I understand the use case for the name / Mob / and the contact variables, but how does knowing their age, gender, and profession assist in contact tracing? My first thought would be maybe something related to behavioral patterns based on those points, but why use patterns when the app itself should tell them exactly where the user has been and for how long?