“Bill Gates has repeatedly said vaccines can solve the overpopulation.”
Nothing like coming out and plainly saying, “Vaccines are lethal.”
To be precise, and IIRC, Gates’ position (prior to the advent of literal killer vaccines) has been: Parents in the developing world will observe that reliable vaccines are readily available to protect children against premature death by various previously lethal diseases, and will respond to that infirmation by deliberately having fewer children.
As in, there is no longer an abiding need to keep having more children to increase the odds that a decent number of one’s children survive childhood.