I would agree if Nreal were a supermarket chain or an airline (as in that case there's a real separation, this is the reason why you have Linux detergent), but since Nreal is (arguably) in a gaming business Epic's lawyers might decided that it's too close to their own trademark. If a future case have concerning the "Unreal" trademarks would have been filed by Epic and the defense have brought up passing-up of Nreal's trademark, the court could have ruled that Epic did in fact not enforced its "Unreal" trademarks and even paved the way to genericize them.