Nah, I doubt that. It looks like the game probably stored the semen and background separately, and the ripper combined them in all the possible combinations (since there is no reliable way to tell which combinations the game is using in those cases). If you take a close look at page 50 and 51, it looks like the semen was applied in the wrong order, so the semen slightly covers the man as well (might be an issue in the game as well, I have seen much worse errors).
If something is lazy, then it is the uploader not properly optimizing the PNGs, I see a 18% size reduction on the first 150 images by running it through PNG crush, so that would be something like 100 MB for the entire gallery.
Base +6, Looklight +6, karavanrob +13, Purple98 +6