Include password in email

In this part of a very helpful video on user registration @ben talks about securing a password with SHA256 encryption. He explains here that it is a one way encryption…meaning that it cannot be decrypted.

Then in this part of the same video @ben dynamically adds the password into an outgoing email that the user will receive upon a successful registration.

If the password was encrypted in a previous step of the same workflow (the Data insert step), then how is the plain text password able to be included in this email? Shouldn’t that plain text password have already be encrypted by the time the workflow gets around to executing the Send Mail step?