Not sure where you got the idea they weren't able to transmit.
Most transmission occurs early but it's still possible to transmit when symptomatic.
I just think it's wishful thinking to believe a recommendation to consider ivermectin for mild or asymptomatic cases resulted in the sharp drop-off in cases India has experienced.
Especially when we've seen almost the exact same curve of cases in other countries that experienced a surge - without ivermectin being involved.
And even less when Ivermectin is involved. You're welcome.