Again, you guys are funny … the point is the lack of evidence especially in terms of secret projects (like the US black programs) and from a country like China is never a proof it „never happens“! We all know, that several secret test specimen flew in the US often several years before the world got aware.
As such I do not rate this as proven, but anyone who knows the Chinese side, they never announce, they never brag, they do their stuff and when a type entered service it is often reported only in a short note months if not years later.
Look at the J-15T: Until November 2024 we didn‘t even know development was finished and if serial production - which was expected - was initiated already and then we out of the blue saw almost 30 flying together off two aircraft carriers.
So yes, we have not proof, but to claim „we are the first“ and the „Chinese stuff is empty or mock-ups on trucks and nothing real“ is plain wrong!