This page is rendered in the browser, so there is nothing to read in its source. The same lists are served as data, and that is what to fetch instead:
/api/export/<username>
/api/export/<type>/<username>
<type>
films
tv
games
books
?format=md
?limit=200
A list includes every entry with its metadata, its score and its notes. For example, /api/export/films/nil is what /films/nil draws.
The lists are large — a megabyte and up each, and over four megabytes for all four of them at once, which is more than many tools will accept. That is what the index is for: fetch it first, then fetch the one list you want, or /api/export/<username>?limit=200 for a bounded slice of every list. Every response carries a Link header naming the same urls.
/api/export/<username>?limit=200
Link