Could you explain more? There's too many negatives in that last sentence for my decaffeinated early morning brain. I'm titillated by the idea there's a way to justify making up things so I really want to parse it.

It means, sometimes the best you will get is speculation, because there’s no definite answers to be had.

E.g. it’d be nice if just hearing the CVR meant you knew the exact cause. Unfortunately not the case here.