There is no decentralization.
As you mentioned, the token works just like usdt or udc, which are fully centralized.

Who decides what to do with the BTC lended? Who holds the BTC? Who holds the data to confirm if wbtc is or not backed up by BTC?
All these items and much more and controlled by one person or company, which makes your project fully centralized.

Your text is misleading imo. You are trying to advertise your service not the way it really is.

You should change title for like "earn interest by lending me Bitcoin" , for example. Because nothing is decentralized there.

You also said "trustless". How would it be trustless if users have to trust you have BTC pegged?