Edit: All their „blimps“ are Zeppelin NT now https://www.goodyearblimp.com/behind-the-scenes/current-blim... and they manufactured them by themselves with parts and know how from Germany.
They assembled the zeppelins in germany. Because it's pretty certainly simpler to ship the parts and a few engineers than to make the trip in assembled blimps.
Edit: All their „blimps“ are Zeppelin NT now https://www.goodyearblimp.com/behind-the-scenes/current-blim... and they manufactured them by themselves with parts and know how from Germany.