I love these types of discoveries. With the advent of archaeology and new modern imaging techniques, we seem to be recovering more and more of what was once lost.
As an aside, Merlin is one of my favorite fictional figures, and C.S. Lewis' depiction of him in That Hideous Strength one of my favorite renditions of Merlin. Lewis imagines him as an immense, serious man who is Christian but only barely—he seems very pagan still—and who can channel angelic powers. You can tell Lewis had a lot of fun imagining Merlin waking up to wreak havoc on the supernatural forces of evil in the 20th century.
https://www.cam.ac.uk/stories/merlin-manuscript-discovered-cambridge