Using Trezor on infected computer

In fact, even malicious Bridge alone won’t be capable of making your wallet vulnerable if you confirm everything on the device.

When you set up your Trezor, your seed is not communicated to the computer. In fact, no confidential information is ever sent to the computer. All calculations using the private keys are done in Trezor, and it only sends the result to the computer. That’s why you don’t really need to set up/use Trezor on a safe computer.