Confederate memorial sites in the United States are interpreted very differently depending on who is doing the interpreting, and there is no neutral version available. Beauvoir is owned and run by the Mississippi Division of the Sons of Confederate Veterans, a heritage organisation with a stated position on the war and its causes, and the on-site presentation reflects that position.
Mainstream historical scholarship holds that the secession of the Southern states, including Mississippi, was driven principally by the preservation of slavery; Mississippi's own 1861 declaration of secession says so in its opening lines. Visitors who expect that framing at every stop should be aware that they may not encounter it here.
This is not an argument for skipping it. The house is genuinely old, the collection is real, the veterans' home is a documented chapter of this coast's social history, and standing in the building where Davis wrote his memoir is a legitimate reason to come. It is an argument for knowing who is speaking. If you want the wider history — slavery on the Gulf Coast, Reconstruction, the long politics of Confederate memorialisation — bring it with you or read it afterwards.
Mississippi voters approved a new state flag without the Confederate battle emblem in November 2020. The argument is not settled here, and pretending otherwise would not help anybody planning a visit.