Locked and unlocked are specified separately in the docs. The image you are describing is for Stock OS pixels that are locked. BFU extraction type means extractions of data available in BFU state and nothing protected by a user credential.

Brute force support isn't a guarantee of breaking the device alone. It just means it is capable of making a quick amount of PIN/password attempts at a short rate of time without throttling or other restrictions. You could use a very secure passphrase that would be impossible to brute force for example.