Passphrase security - words vs punctuation

I just came across this blog post on selecting passwords

[https://jacobegner.blogspot.com/2020/11/suggestions-for-creating-passwords.html](https://jacobegner.blogspot.com/2020/11/suggestions-for-creating-passwords.html)

It's an interesting read, but what I want to discuss is the claim the author makes:

\> Don't try to add a flourish to a passphrase, like changing one "s" to a "$" or throwing in a digit between words.  Adding words to a passphrase is the most efficient way of adding memorable strength to a passphrase.

And what I wonder is, in practice, is this true? It's my …

passphrase privacy security