The same forces are still imposed on the material regardless. It's cheap nasty aluminium. Tell me, if its so good, why hasn't it caught on in OEM circles? Because nobody on their right mind would trust aluminium to hold on a wheel which is subjected to extreme longitudal and lateral forces. And lets be honest, what are you gaining from using aluminium compared to steel wheel nuts? A few grams of unsprung weight per corner, or is it for the bonus JDM SCENE POINTS YO! ???
Quite simply, cheap aluminium wheel nuts arent worth jack sh*t, they use steel for a reason.