Does this mean novelists who think up crimes, research how they might be accomplished, scout out settings and methods to make the imaginary events might believeably take place, write out the plan in the form of a thrilling
adventure and then circulate it through an accomplice
(otherwise known as a publisher) can now prosecuted on
these grounds and in this fashion?

Probably not, unless of course the totalitarian regime under which we now live decides it wants to. Which is why Thomas Jefferson and pals devised the constitutional protections we used to have.