I am still asked for Touch ID even though I have the AutoFill Convenience Unlock Timeout set to X minutes?

Unfortunately, this is the AutoFill subsystem requesting the Touch ID and not Strongbox. It seems that even though Strongbox tells MacOS it can provide a login credential for a website/app without any UI interaction, the system decides to request a Touch ID authentication anyway. Sadly, we cannot change this behaviour, and so our convenience unlock feature for AutoFill is less than ideal on systems with a Touch/Face ID sensor, or Apple Watch authentication.