JWST and Dark Energy (Score 2)

I just watched the recent TAM 9 from las vegas and in it Lawrence Krauss states that the JWST would not help us find more about dark energy but unfortunately does not go on to explain why due to time constraints. This question has been eating away at me, could you explain why the JWST wouldn't help us learn more about Dark Energy, or at least what Krauss's argument might be that it wouldn't. Thanks!