Looks like an S Duct. The reason that T50 is suspect on this is you can see the engines from the intakes straight on. Here we don’t see any sign of that. It’s not that on other stealth models you can’t see the engines looking down the shafts it’s just that to do so requires contortion. The goal is that radar waves going down the intakes will reflect off the engines but being angled inside the fuselage the waves will reflect off the ducts at angles.