Answer

Upadhyaya Shri Praveen Rishi ji Maharaj is generally identified with the Śvetāmbara Sthanakvasi tradition, not Digambar. This is supported by Jain sources linking him to Acharya Shri Anand Rishiji of the Sthanakvasi/Shraman Sangh line, and Anand Rishiji is explicitly described as Sect: Swetambar, Sub-sect: Sthanakwasi. ( arhamvijja.org)

Explanation

His spiritual lineage comes through Acharya Anand Rishiji Maharaj, who is recorded in Jain sources as a Śvetāmbara Sthanakvasi saint. Publicly available Jain organization pages also connect Praveen Rishi ji to the Vardhaman Sthanakvasi Shraman Sangha. ( jainsamaj.org)

Takeaway

So, the best answer is: Śvetāmbara, Sthanakvasi tradition. ( jainsamaj.org)