Just after the “discovery” of the New World, it was referred to as the Spanish disease.
Yes, indeed— billy boy has tertiary syphilis. Colleagues in neurology/surgery concur (not publicly, of course). The staring eyes (without apparent focus) is part of the differential diagnosis, physical assessment. His gait would be of interest if there is a video from the parade.
These photos were like those of the Ceaucescus in the last days- total delusion coupled with arrogance.