Another way of looking at it is like this.

The WHO estimate has dropped to 70 million with HCV.

Currently, we treat 17 million patients with HIV with 52 weeks of double, triple or quadruple antivirals.

These antivirals are similar to HCV antivirals.

So 17 million full year treatments are the same as 17*52/12 = 73.6 million 12 week treatments.

In short we have proven capacity to make enough antiviral medicine for every patient in the world with HCV in a single year. We already produce more than this quantity for HIV.

It took us 10 years to get to that scale, but still, it is quite clearly doable without raising much of an industrial sweat.