Thanks for the read and ditto on the 5 pages needing to be viewable in just 1 page.
The full article is close to 100 paragraphs. Putting that all on one page would intimidate and lose a bunch of readers. Even choosing to put 15-20 paragraphs on a single page makes it a "wall of text" that will put off many readers. Of course, the real problem is the short attention span of the Internet age but it's hard to fault them for trying to avoid scaring off users.
Half view the pagination version, half view the 1 page version – and see % of the users that actually finish the article.