Well you can, it just takes the extra step of grabbing the download from the page. I have done it before but I dismissively misspoke and should have said full index of subtitles available.
But can you -- without paying? AFAICS, only if there are fewer items in that full metadata list than the number of pages you can download for free. And the impression I got from this discussion was that this is definitely not the case.
How long would it take for you download all 6.260.893 subtitles listed in the "dump" with these limits in place?