The entire plane has to be redesigned from the ground up, that’s what he’s explaining. The F-35s are caked in sensors like a valve index. They have special paints and materials that absorb radar, making the radar profile look more like a bird than aircraft-sized hunk of metal, which is useful against Russian and Iranian anti air SAMs, the same ones taking down Ukrainian jets. But that also includes the body shape, the engine intakes (even engine blade materials), everything.

Can the Europeans create an F-35 class platform? Absolutely. But you can’t just retrofit your way out of a brand new generation of plane. It’s like trying to retrofit a Ford F-350 super duty to conform to Japanese Kei truck regulations and weight classes. You end up redesigning the whole thing.