There is still one in Fukuoka, and a somewhat smaller one of the Unicorn Gundam in Tokyo. It was originally supposed to shut down I believe in 2022 but they extended it because of Covid.
There is still one in Fukuoka and a smaller Unicorn Gundam in Tokyo still! But yeah, the real big one is gone. Apparently it was becoming a hazard, as the weight and movement of the Gundam was compromising the structure of the dock itself and maintenance costs were getting really high.
