I admire the effort but it's hard to get excited about looking at some ancient illustrations which have been partly filled in by AI. I want to see the work of an actual specific artist, and be briefly transported to the times they lived in.
I have this old book of the Audobon bird illustrations and those are truly incredible. Back in the day there was a public audience for high quality, expensive art prints in books and they spared no expense.
If you see the blog about the process linked in another comment, you see that AI was used to stitch 2-page images together that could not be flattened to be scanned together, and to remove the seam where the book binding pinched away part of the image.
Comparing the before and after, they appear to be quite accurate to the originals; almost all of the "restoration" appears to be in color correction for faded ink and paper.
https://www.c82.net/blog/making-of-naturalists-library
You are correct! Apologies for not doing enough reading myself.
The original scans are also available.