So does PLA, both materials are amorphous polymers so they are never “truly” solid unless they are frozen - nor are they really ever molten either. That is why screws and bolts etc always seem to “work” loose on 3d printer parts - they don’t, the material just flows away from them.
It’s just that at the glass transition temperature is when they go from slowly getting softer the hotter they get to suddenly completely rubbery and floppy.
And at rather ridiculously fast paces, as demonstrated by comparing the different versions of Midjourney
The difference in being able to generate realistic humans is even more striking.
The question is where do the current LLMs fit in that kind of a timeline.