I think the point being made is that there is very little room for creativity there... There are tons of examples of physics engines written in multitudes of languages with a full range of quality of implemention.
Now if the LLM had known to look for and found dark matter or gravitational waves all while sitting there on your computer comparing micro changes between CPU cycles, maybe you would have a point. To my knowledge most physics engines do the even emulate Newtonian physics nevermind more modern variants
