The article was interesting, and the quotes were solid, but the article was two-tone. I don't think the article was written as well as the quotes it cites.
I also think the articles basis, i.e. the stereotypical IT person who has no interest in the business at large outside of technical domains, is a fictional construct.
A better explanation is that silo-ing your IT department, for cost and change control reasons, creates conflicts of interest between satisfying the needs of end users and obeying the instructions that come down form on high. Also the vast proportion of the work done in IT is non-functional, and the non-functional element is proportionally higher the larger your IT infrastructure and the more consolidated it is.