Just to be clear. Nobody, ever, needed to inflate a highpoly to match it better to the lowpoly. I have never seen such a stunt in the past 25 years, 20 years of which we are using normalmaps. If you have tools that need such a thing, get better tools. The goal is to capture the highpoly as good as possible in as little…
My guess his advice goes to cage model rather than low poly itself. Or it may work when you bake world space normal map to be re-baked into tangent space in a separate pass . Especially when you use some 3d party renderer that is not directly supported in package bake tool. For world space normals the actual shape of low…