Unfortunately I can't find any archives of Apple's website advertising TouchID when it first came out, but as I remember it was touted as "revolutionary, most secure way to protect your phone", etc. Below[1] is the keynote from 2013 when it was announced. At one point the speaker says "Your fingerprint is one of the best passwords in the world." He also says stuff like "this is the most advanced technology ever in an iPhone", refers to TouchID as "very high level of security", etc.

The FaceID marketing is the same. The iPhone X advertisement released today[2] says "your face is now your secure password". The website says "Face ID is so secure you can use it with Apple Pay". During the keynote today they actually even said up until FaceID, TouchID "was the gold standard". About FaceID they said "FaceID is the future of how we will unlock smartphones".

You'll note that nowhere in any of it's materials or even in the deep recesses of it's website does Apple acknowledge that even though Face/TouchID is great, it's still not as good as a strong passcode. The closest they come is during the key note they acknowledge "nothing is perfect, not even biometric", but you'll notice that even this statement subtly tries to imply that biometrics is the highest security available ("not even biometrics").

1: https://youtu.be/X5zt1V7H88I?t=227 2: https://youtu.be/K4wEI5zhHB0