BREAKING NEWS! NASA wants a better, cheaper SLS! Why is the answer not Starship?

NASA thinks they can get a better, cheaper SLS. Is this really possible? And why is Starship still not acceptable to them?

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SLS SRBs
https://www.nasa.gov/sites/default/files/atoms/files/sls_solid_rocket_booster_fs_03122018.pdf

More SLS info
https://www.nasa.gov/exploration/systems/sls/factsheets.html