Emergency powers forfeit almost all tribunals. If he manages to get the WHO to court then perhaps. I think most will throw it out if there has been death from the disease. Despite of the response.

It would be the trial of the century if he pulls it off in the international court. But holding individual nations into accountability for their actions based away from courts, emergency power, is a presumption this case even proceeds past its opening. By its opening submisson it won't. There has been almost no other means to detect COVID. Therefore justifying response.

They have committed the perfect crime. Disease causes the test increases the disease causes the response causes the vaccine. Emergency powers faster implemented on death throw out any verdict.