What evidence do you have that this wasn’t due to solar radiation?

In practice such an event is rare, and I would expect there to be enough shielding to avoid it from interfering with the electronics. The fact that there is no hard evidence is why it's hard to argue against this clickbait claim, since technically they could be right.

	▲	adrian_b 3 days ago \| parent [-]
		The cosmic radiation that reaches Earth's surface consists mainly of particles that cannot be stopped by thin shields (e.g. muons or other particles with very high energies), otherwise they would not have passed through the atmosphere. So shielding is not a solution that can be applied in a vehicle. You need something like an underground bunker to be sure that no cosmic radiation can penetrate it. The only reason that makes rare the events caused by cosmic radiation is that if those particles can pass through shields that means that in most cases they will also pass through the electronic devices without being absorbed and causing malfunction.