I had Samsung s9+ in 2018 and I did have monthly security upgrades up until 2022 when I had it. Their promise was 5 years of security upgrades.

I also had the latest Android version. iirc they promised 3 years of OS upgrades

Casting fear, uncertainty and doubt over a manufacturers claims is literally what FUD stands for. And that's what you're doing.

This topic will probably resolve itself from 2025 on when the EU will start requiring 5 years of software updates.