The article you are looking for likely discusses the or "Memory Panel" mod for The Sims 4 , created by the well-known modder Lumpinou .
Sims who experienced an event together can share that memory, which helps deepen their relationships. Why It’s Called "Mod for Lifelong..." Your Memories / Memory Panel: Mod for Lifelong ...
The mod automatically captures big moments (like births or promotions), but also allows you to manually "capture" a moment that you find significant for your Sim's story. The article you are looking for likely discusses