I covered this in more depth in my other comment, but quite simply, your entire premise here is wrong. This research was about whether or not the expansion of

I covered this in more depth in my other comment, but quite simply, your entire premise here is wrong. This research was about whether or not the expansion of the universe is accelerating, and it casts some doubt on our belief that it is. It does not invalidate all of the evidence, potentially just that of measuring supernovas. Not only does this research not cast doubt on whether or not expansion is occurring, it would be nonsensical and couldn't exist in a meaningful way without taking expansion as a fact.