Do you know where NASA's launch facilities are? The Florida coast.
The Florida coast isn't defined by a huge, meandering river. Take a look at some satellite surveys that showcase how the Mississippi River changes over time. We've of course damned up the shorelines upstream where people live in places like New Orleans so there's no inherent seasonal risk of mass flooding, though of course lose the deposited silt and hence further erode the land we've "saved". Further down south toward the mouth, it's marsh land defined by however the river chooses to meander. I'm not sure where exactly SpaceX is planning to setup in LA, but the entire coastline there is chronically very poor, very unpopulated, and not supported to weather flooding of any kind, especially not hurricanes.
Take a look at this site: https://tropicalcyclonedatabase.com/storm_tracks.html?_v=90
Filter Lifecycle Intensity by category 4 and 5.
You won't see any lines close to land near Cape Canaveral. Though to be fair, Vermilion Parish seems to be far enough west in Louisiana that it doesn't get direct hits either (but some are close).
Then look at the NHC Storm Surge Risk map: https://experience.arcgis.com/experience/203f772571cb48b1b8b...
Cape Canaveral is mostly 0-3 ft with some >3 ft. Meanwhile the entire immediate coast for the new Louisiana SpaceX location is >6 ft to >9 ft.
I think they'll probably have more a lot more trouble with storms than Cape Canaveral. The dynamics along the Atlantic coast are a lot different from the Gulf.