If anything, the synopsis was toned down a bit.
If you haven't played the first (and can withstand PS1 era visuals), I'd recommend it as well. It really sets the stage for what the series is about
https://www.youtube.com/watch?v=CRnrSlL-Oug
Grab some popcorn because its a hell of a ride.
I view the MGS games as glorified soap operas. They’re a lot of fun and the plots are addicting, just don’t think about them too hard.