The answer is that the International Olympic Committee (IOC) has recognised the World Bridge Federation as a sport organisation, and as such, bridge is subject to the same regulatory environment as any other Olympic sport.
Tourette Syndrome is one type of Tic Disorder. Tics are involuntary, repetitive movements and vocalizations. They are the defining feature of a group of childhood-onset, neurodevelopmental conditions known collectively as Tic Disorders and individually as Tourette Syndrome, Chronic Tic Disorder (Motor or Vocal Type), and Provisional Tic Disorder.
The tics must be motor and vocal in nature. The tics must be frequent, never stopping for a period of longer than 2 months. They also must be causing a significant impairment. Tourette's disorder is a combination of multiple tics, AD/HD like symptoms, and obsessive-compulsive difficulties.