Its not even “more energy than was absorbed” really, as they’re just counting the proportion absorbed in the compressed core of the pellet not the large fraction absorbed in the ablative outer layers (or by the hohlraum).
As far as I’m aware the big achievement is that the experimental yield is only a few percent away from the simulations – something that has dogged them for years. If the simulations now match that indicates they mostly understand the processes involved.
