What do you mean with 'fictive Czech genius'?
...are you questioning Jara Cimrman's existence, work and heritage?
shareAlas, there are still some unenlightened souls who could be called "Cimrman deniers", similar to global warming deniers and holocaust deniers.
The fine little Cimrman museum at the bottom of the Petrin tower should dispel all doubts about the reality and greatness of this latter-day Renaissance man.