They use a “page-break-before: always” on the header styles in the CSS to get a page break before the various elements they put in the initial (and final) source file, which is a perfectly reasonable way to do it.
When I edit a PG ePub for my own purposes, I always split them up so each element of the introductory material gets its own source file. This is very easy to do in the Calibre editor.
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