I don't think India would weaponize H1-B, but it wouldn't be beyond Russia or China. BTW, having sleeper agents deeply implanted in other countries is an insurance policy.
China and Russia were the two countries I was primarily thinking of when I wrote that post. It's worth pointing out that in the international spy game your friends also spy on you. I feel confident India has agents in the US.
They would be stupid if they didn’t. The US has a tendency to meddle in internal politics of other countries and having sleeper assets in sufficient numbers is a deterrent.
Unfortunately, for these countries, H1Bs are very easy to locate.