The relevant question isn't what Samsung has promised, but what they will actually deliver. I think we should be pretty skeptical of that promise based on Android's track record.
Don't get me wrong, I'm not a fanboy and immensely dislike how iOS users are restricted in other ways, but updates and longevity are unparalleled in the smartphone world.
https://www.aninews.in/news/tech/mobile/samsungs-55-years-ol...
It's not like Apple is delivering all security updates to these old phones either. This one looked pretty critical to them, as the article says it “may have been actively exploited”.