You seem to not be able to comprehend that the J-20 was always designed with the WS-15 in mind; that was always the end goal engine. OTOH you or anyone else has provided literally ZERO evidence that a GaN-based radar for the 055 ever existed or was ever the end goal for the original 055 design.
You also seem to not be able to comprehend that it would never just be a simple change change of radar panels and software, but also a change in computing power needed, a change in operating and maintenance control panels, a change in power requirements, and a change in cooling requirements, all of which involve changes in hardware, software, and shipboard space. I have already stated this over in the 055 thread, but it looks like you conveniently didn't read it.