"The Rule of Rationalist Fiction states thwat rationality is not magic."

In other words, such a hypothesis about Voldemort's plan is defensible only if there's a better explanation for how he could pull it off than "he's just that good."

Granted, Voldemort also has access to magic. But based on what we know about how magic works in this universe, it seems unlikely that, even given magic, Voldemort could acquire the knowledge necessary to be confident of making such an excessively complicated plan work.