Seems like a more likely explanation is a hysteresis issue with the hardware lid sensor. It "opens" under vibration and allows the transient key events to be seen by whatever controller (my guess is that all this is preboot, so the CPU firmware isn't invoked) is listening for the wakeup events.
Basically, if the key sensors can be jiggled closed, the lid sensor can be jiggled open. And because these happen for the same reason at the same time, that's not a two-point failure mode; it's something you'd expect to happen.
I think that's probably the most plausible explanation. It makes me wonder what kind of g-forces the laptop is encountering. Most electronics aren't intended for "rugged" environments, and "ruggedized" equipment is a lot more expensive.
Honestly, I think this is a situation where Apple hardware is fragile instead of simply "not ruggedized". Traditionally laptops had hinge locks, for example, but the industry moved away from that because the unlocked hinges were perceived as nicer. Apple has always driven this process more than any other manufacturer. It's probably that they simply got burned here and chose a set of sensor/key/hinge designs that were a little too aggressively "thin".
Basically, if the key sensors can be jiggled closed, the lid sensor can be jiggled open. And because these happen for the same reason at the same time, that's not a two-point failure mode; it's something you'd expect to happen.