Is that 5.3’s material shader cost view mode? The viewmode is broken after 5.3 and shows green on everything unless the material has a really bad issue(so that red is killing pixel shading cost). You also need to view the shaders without Nanite enabled in the viewmode. Besides, your nanite base pass isn’t the bottleneck, you’re killing the visbuffer with overdraw.
Also that “other guy” messed with something in the benchmark, Lumen was not configured properly between his test and a removed comment was saved in this post explaining it