I’m sorry, but this makes no sense to me. Are you saying that the Church changed the definition of Usury, and that is the reason that lending money at interest is now not sinful? That can’t be right.
Can you explain how you believe finances have changed such that interest was once sinful but now is not?
I will provide an example that may help. In medieval times if I were to loan you $100 for a year and asked you to repay me $105, that would have been condemned as sinful by the Church as Usury. Do we agree on that? But today, I could do the exact same act - loan $100 for a year and ask for $105 in return, and the Church would say that is not sinful. Right? So what has changed to make that act sinful in the past but not sinful now?