Hey Nino_Mancuso, just wanted to follow up on this post. The guide works as intended, you must have skipped a critical step. You need to change the Translucency Lighting Mode from Volumetric NonDirectional to Surface Translucency Volume. Once you make that change, the pins that were greyed out become usable again, and the how-to guide is perfectly functional.
We are planning on updating this page in the future, as UE5 is on the way, but for now it’s still functional as-is.