My understanding is the "Word" = Christ
Exactly. I’m not sure what this author is trying to prove about a difference between Scripture “being the Word” and “containing the Word” but it is clear that the Logos (Word) preexists even the wrold, and was made flesh via the Son.
Perform a word study.
There are reasons why these particular words are used and not others.
There also are reasons why our Lord Christ Jesus is also identified with other names.