Please explain how TouchID with a secure password is dependent on DRM?
Thank you for the link to Apple's support page. Here's what you were asking for:
Every fingerprint is unique, so it is rare that even a small section of two separate fingerprints are alike enough to register as a match for Touch ID. The probability of this happening is 1 in 50,000 for one enrolled finger.
1/50K is small enough to brute force if DRM didn't prevent it. Some of DRM may be implemented in hardware on newer phones though.
If you don't want 1/50K bruteforceability (i.e. you want strong end-to-end security) you have to turn off TouchID.