This comments shows that most of the users in this thread have not done game development.
We are judging the usefulness of a LLM in a project that is really over represented in training data (a bunch of Intro to Programming courses requires a project like this, and in southern Europe countries we have a lot of similar games like the one in the blog)
In the first year of college I reimplemented Moon Patrol in Python, I had no previous experience basically and it tooks me two/three months of work coding 3 days per week mostly.
Coding a card game is easier than that. LLMs are useful for certain things but this is not a good way to benchmark their usefulness in any type of game development coding.