I think the opposite is more likely. Put a bomb in a remote controlled car - you're going to need one either way - drive close to your target, detonate. Done.
With a machine gun you have to drive close and then aim extremely accurately.
It sounds implausible - at least not without AI superpowers in the targeting system.
At the very least you'd expect lag to be a significant problem.
Yes this strategy is much more complex but I would argue it has more precision and certainty around its efficacy.