EA Co. only made cast lowers. They never made forged receivers. After EA went out of business, all their investment casting tools were bought by DPMS and used by them to manufacture receivers.
This doesn't mean they're bad - in fact they can be quite good. I've built many guns on EA lowers and they worked just fine. So if you want to buy a good, reasonably priced pre-ban lower, you should consider this EA lower for sale.
But they're definitely not forged.