The choice of radar emitter array tech has zero impact on the shape of nose cone of an aircraft.
You only need to change the shape of the nose cone if you want a bigger radar array.
Also, AESA radars can be mounted normally or canted, but again, the choice of mounting does not have to impact the size or shape of the nose cone.
Finally, the BLK3 prototype looks to have an all metal nose cone, which could mean it isn’t carrying a radar at all. This would be supported by nose tip mounted pitot tube, which is pretty rare on aircraft with AESA radars, and tend to only be present if the aircraft had such a pitot position before upgrading to AESA. No aircraft that has AESA installed from the get go has a pitot there.