@Anke I noticed that too. I guess trophy data can only be stored on one profile at a time. If I were to change my name a second time, the Kuro one would probably be blank as well.
Speaking for myself, the oldest game I have that has active online support and DLC is Burnout Paradise (the original on PS3, not the PS4 remaster). I have all the DLC and was able to load up Big Surf Island (a DLC map) and access all DLC cars without issue, and that game was released in early 2008. If that still works, hopefully everything is fine.