tdarb, 
I played and beat the original Demon's Souls on PS3 years back. Now I've completed and obtained Platinum for the PS5 version.
For anyone else looking for a step-by-step guide to the Platinum trophy as well, I made a simpler version of the existing "checklist" website:
https://demons-souls-platinum.netlify.app/
(My version is ~30KB while the original web page was over 3.5MB 😬 )
