"... during the injection-molding process plastic is injected directly on the grooves of a record stamper which copies the information more accurately. With current methods, plastic is pushed into the grooves at an angle. What's more, there's no pressure on the stampers with injection molding so they can be used longer before sound quality is affected."
Something doesn't add up here. If you're going to inject plastic "directly on the grooves", it implies a thick, one-sided record. If you're doing standard injection moulding, the plastic still has to flow across the grooves (from the centre to the edge or vice versa). Perhaps the only advantage is the plastic will be at a more uniform temperature as it is injected.