Assuming the "problem" you are referring to is authentication, this is not necessarily true. "Something you know" is just one auth factor of several. Using a thumbprint (something you are) to grant access to a private key stored on a device to sign a challenge does not rely on human memory, and is probably more secure than using a password in most cases.
An argument can also be made that using a password manager implies that you are specifically doing the opposite of relying on human memory for authentication.
That said, I also disagree with the premise of the original comment that "Passwords should be dead soon and this article should be irrelevant soon after." They will be around for a while, although I hope passwordless mfa can soon replace them as the default choice.