Why shouldn't the goalposts move? That it was possible to beat or tie a chess master, if you had enough computational power, was basically the content of a theorem of Zermelo over a hundred years ago. It differs not a whit from tic-tac-toe. Even Eliza was practically passing the Turing test, which seems comically silly now. There's just an incredible amount of computational power so all sorts of things are possible that were formerly unimaginable - like training LLMs on the whole corpus of extant human discourse.