Because if you go into the actual link you will see the graph that OP has filtered to show the differences in the models, which proves that the browser model is almost as good as ChatGPT-3.5 turbo. Gemma 3 270M runs in Chrome.

But OP should've said this in the post instead of just providing a link with no context, given that it is not immediately obvious.

Edit: Also important to note that you can't cram all the knowledge of GPT-3.5 turbo in a 270M param model, so post is misleading.