Honestly, we can't hear any good from the banks as these institutions are the leading haters of Bitcoin since before. They are afraid to lose their existence but as we can see, it was not going to happen and much more if they adopt the system as well.
True. El Salvador is a good example of how banks can become manipulative when their personal interests are manaced. They start spreading lies and fear among most uneducated people while sponsoring protests against bitcoin to give the impression the population is mad at the idea of adopting a crypto currency.
Notably many of the so called experts who say bitcoin is going to die soon (once again) are connected to banks, as they belong to the mainstream financial sector. So they create the narratives that are shared by another people who are also benefited by the banking industry, like the employee mentioned in OP.