Probably because 1) the alleged actions were completely different and 2) that didn't actually happen.
(To be clear: It was not alleged that Goldman delayed aluminum deliveries to raise the price of aluminum. The allegation was that Goldman paid people to store metal in warranted warehouses that had slow withdrawals, which had the side effect of raising the premium which metals in non-warranted warehouses command over metal in warranted warehouses. Not only is it not clear that this happened, it's also not illegal—the lawsuit was thrown out. Plus, the actual price of aluminum was actually falling over this period, and nobody thinks Goldman's actions influenced this price.)
(To be clear: It was not alleged that Goldman delayed aluminum deliveries to raise the price of aluminum. The allegation was that Goldman paid people to store metal in warranted warehouses that had slow withdrawals, which had the side effect of raising the premium which metals in non-warranted warehouses command over metal in warranted warehouses. Not only is it not clear that this happened, it's also not illegal—the lawsuit was thrown out. Plus, the actual price of aluminum was actually falling over this period, and nobody thinks Goldman's actions influenced this price.)
If you'd like to read a lot more about aluminum markets than you probably want, this article is pretty good: http://www.bloombergview.com/articles/2014-09-03/the-goldman...