Sola Scriptura Syllogism

I was clearing out some old files on my harddrive today and came across I snippet I copied from somewhere on the Internet:

1. Sola Scriptura [implicitly] says everything we need to know that is necessary for our salvation comes from the Bible alone.

2. Knowing what Scriptures are inspired and what Scriptures are not inspired is necessary for our salvation.

3. Knowing what Scriptures are inspired and what Scriptures are not inspired cannot be known from the Bible.

4. Therefore, Sola Scriptura cannot be true.

I’m not sure, but this seems like something Patrick Vanderpool would write…