Tower was built when the studio was still opetational.Really all that stuff happened after DHS stopped being a working studio. ToT just happened to be one of the first major things built after that. It became more of a lost continent after the shutdown, but, they managed to keep things themed to studio's and entertainment. I'm not sure why people don't think so. Doesn't matter anymore anyway, what is important is what it becomes, not what it was.
Not to mention designed in the era that brought Splash Mountain and IJA. When total immersion mattered.