Certainly could be, and doubtful that they are fully insured against all contingencies... Possible they are underinsured against for intentionally, since they could conceivable think it's low enough risk that it's cheaper to allow a loss even as big as this to fall under operating losses for rare or occasional incidents like this.

Once a company is big enough even subjectively huge losses are simply a calculated risk. Do you pay a million dollars a year for 10 years to subsidize something that might cost 10 million dollars that only happens every 20 years, or do you bank on it not happening and write it off as a bad quarter if it happens?

Way more goes into those calculations than one might think, and if they're self insured there's just a budget item that takes a hit for this and someone gets chewed out it fired for being the one that gambled this way... While someone else loses a promotion if they signed off the other direction and paid for a million dollar policy they didn't need.