Can a sorcerer who harnesses jinn know people's bank account details?

The jinn do not know the Unseen, and the story of Solomon (peace be upon him) attests to this in Allah's (the Most High) saying: "And when We decreed death for him, nothing indicated to them his death except a creature of the earth eating his staff. But when he fell, the jinn became clear that if they had known the unseen, they would not have remained in humiliating torment." (Qur’an 34:14). As for the jinn knowing about bank accounts and the like, this is due to their direct observation of humans without humans perceiving them, as Allah (the Most High) says: "Indeed, he sees you, he and his tribe, from where you do not see them." (Qur’an 7:27). This is not considered unseen for them. Then, they inform their allies among the soothsayers and sorcerers. Ibn Taymiyyah mentioned that the devils inform soothsayers and sorcerers of some unseen matters that they snatch by eavesdropping, or what they see of matters that are not unseen for them.