The idea is loopy because the energy that reaches the earth from even a massive solar flare is orders of magnitude less than the energy released by a major earthquake, and that is orders of magnitudes less than the energies that drive the dynamo in the Earth's core.
It's possible for a falling leaf to hit a mountain in just such a way that it dislodges a boulder balanced on top, but you need to tell a pretty compelling story about why this sensitive arrangement came about. Similarly, you'd need to explain how gigatons of molten iron sloshing around deep underground might feel the kiss of the Sun in just such a way that it levels San Francisco (for example).
It's possible for a falling leaf to hit a mountain in just such a way that it dislodges a boulder balanced on top, but you need to tell a pretty compelling story about why this sensitive arrangement came about. Similarly, you'd need to explain how gigatons of molten iron sloshing around deep underground might feel the kiss of the Sun in just such a way that it levels San Francisco (for example).