Important caveats, for the lazy:

- SGX is disabled by default, it has to be enabled for this exploit to be relevant

- POC requires privileged execution, at which point you can safely assume all is already lost

Anyone who has spent time around digital logic circuits will know that messing with voltages will cause errors. If the power lines are too low some transistors will not be able to switch their load. Or too high and you will cause parasitic losses or capacitance in unexpected places. This is actually a really nice attack to show off to people with an interest in computer/electrical engineering because it demonstrates how a basic design constraint can cascade in unexpected ways.