Well, China sort of broke the schedule. Before 2024, Americans tended to do it for generations, "launching" new generations ahead of schedule.
Before it seemed that wave of pure deltas(GCAP, T-75) will predate pure tailless aircraft(NGAD).
Not the case anymore. And if one can write off J-36 as something new(interdictor cruiser whatever), with Shenyang aircraft it doesn't work.
Their electronics and architecture may probably be similar in conceptual level. Signature won't, and it's hard to see any magic trick US can pull off to overturn the board.