Is a launch from the marshall islands to hawaii really representative of a ICBM strike? Seems to be more similar to a IRBM strike, which is going to have a different flight arc and re-entry speed than an ICBM that actually has to build up enough energy to arc from a continent away.
It wasn't from Marshall islands at Hawaii as the target. The simulated target was the west coast, with it flying out roughly near Hawaii. There's a open source intelligence blog that confirmed this by noting where the navigation warning areas were announced during the test: https://sattrackcam.blogspot.com/2020/11/sm-3-block-iia-miss...