What is the ruling of seeking Istikhara using the holy Quran according to the way mentioned in Biharul Anwar?…

What is the ruling of seeking Istikhara using the holy Quran according to the way mentioned in Biharul Anwar? The way is as such: Opening: Sheikh Imam Al-Khateeb Al-Mustaghfiri mentions in his supplications in Samarqand: if you want to be optimistic by Quran, you can recite the Sura of Ikhlas three times and then pray on Muhammad and his family members three times, and say: [allahuma tafaelt bikitabat wa tawakaltu alaik, faarini min kitabak mahowa maktoom min siraka almaknoon fi ghaibak ]. Then, open the full Quran and take the first line of the first side without counting the pages or lines. This is how it is narrated about the Messenger (PBUH&HF)?