Author here, they are conflated for good reason. The printing press is really an advancement of the movable type system developed in Asia. What Gutenberg did wasn't really about the screw press as I elaborate on here:
The screw press already existed in Europe and was widely used. Reducing Gutenbergs invention to just being about using a screw press does not do justice to what he did. It was really about combining several techniques to advance printing. Better alloys for types. Better system for duplicating types. Better ink. A lot of the advancement could have been made even without the printing press itself. And the printing press without these advancement would have made very little improvement.
https://erikexamines.substack.com/p/why-was-the-printing-pre...
The screw press already existed in Europe and was widely used. Reducing Gutenbergs invention to just being about using a screw press does not do justice to what he did. It was really about combining several techniques to advance printing. Better alloys for types. Better system for duplicating types. Better ink. A lot of the advancement could have been made even without the printing press itself. And the printing press without these advancement would have made very little improvement.