The sources posted are pretty much the only we even can have. Naturally for these kind of weapons systems we essentially only have the public information, that

The sources posted are pretty much the only we even can have. Naturally for these kind of weapons systems we essentially only have the public information, that includes western weapons systems. And all of them naturally boast that they can defend against well, everything. Only when something is actually tested in the field we can see how well it works. Hence Russians have an incentive to deny that it was due to weakness of their CIWS. Or, perhaps more probably, an incentive to say to Putin that they didn't corrupt all the maintenance money and it was just an accident.