After having gone through the mismatch of the old (manual) and new (automated) methods of counting games available from GOG, and getting the mismatch between them down to 0, I've removed the old list from this page and archived it here for now.
If you're interested, most of the mismatch was because of Telltale games that had been removed from sale, and Ys I & II Chronicles+ that were counted twice in the old list, as well as Close Combat that didn't have a GOG row in the availability table and as such weren't included in the new lists.
17 titles were added to the removed from sales list, and 6 articles on PCGW saw their GOG row in the availability table removed (Telltale tiles) to match their removal of sale.
So basically the new process is fully automated for now. :)