Historically, the term colophon was also used to indicate the brief statement at the end of a book with details about how it was printed.
Ah, I see. Ok, normally the 'colofon' pages I'm familiar with - especially with publications like periodicals - will include that info but only as an afterthought or a footnote, the 'meat' is the details behind the publisher, addresses, people involved (editor) and so on.
Historically, you're right, but it strikes me that I haven't read a book in the last ten years whose labeled colophon didn't focus on typesetting. Of course, all the publication information is in the front matter, just not labeled in the same way.