Fath's call let Guding and his team learn about the real situation the Gates family was facing.
Fath's parents, as well as the elders, had not participated in the project negotiations, not because they were ill but because they had been poisoned. It was a strange, slow-acting toxin that had stumped many doctors and pharmacists Fath had consulted. A few days ago, Fath's parents and the family elders had all fallen into a coma, and out of desperation, they followed a doctor's advice to cryogenically freeze them, delaying the spread of the toxin.
As for why Fath had not been poisoned, he did not know the reason himself.