No, only certain political circles within the US try to portray it as a simple rip off, but everyone with a bit understanding knows that regardless all undeniable stolen data - and so far no-one ever claimed, the whole package of CAD-blueprints was stolen - the FC-31 is NOT copy. Alone due to having two engines it cannot be a copy. But you take this again for granted since it fits your opinionated it allows you to continue with this …
Again, plain wrong, since J-20 and FC-31 are totally unrelated. We all know, that the true SAC contender for the XXJ project was a large, heavy tri-plane design, that was less stealthy and allegedly less capable than CAC‘s design. In consequence, CAC won and developed the J-20 and SAC‘s design was abandoned.
In order to remain in fighter business, they started development of a smaller, eventually more multirole focused and carrier-suitable design, which became the FC-31.
Since at that time, it run not at the same priority it was „downgraded“ a private project aimed for export, but hey, do you really think in China a company like SAC is allowed to deVelop such a project with at least PLA and CMC agreeing?
Anyway, to portray the J-35 has a type that is full of issues and delayed since it is based on a lost contender and even more a copy of the F-35 is plain wrong.