You probably missed the "digitally processing" part. Reading it isn't that difficult (still much more than french or english) but due to spelling variance and some other challenges it is mich more difficult to adapt existing models and architectures designed for modern German to premodern German.

In my case, working with administrative documents, there is also a problem concerning gerne-specific words (old terms for legal xoncepts basically) which for example are not well understood by systems created for modern German.