

That’s only because they’re designed with passivation to vent tanks and disconnect batteries to remove sources of explosion when they start to die. If that fails the tanks eventually pop from thermal cycling or the solar panels overcharge the battery until it blows up like a Russian satellite did earlier this year.
They say “artificial sun” because that’s what it is though, there’s no fusion reactions here they’re just microwaving hydrogen to millions of degrees to study the kind of thing that would happen IF somebody runs a fusion reactor for 22 minutes.