You're vastly over-estimating the difficulty of making a web page and even more vastly under-estimating the difficulty of LLMs.

I doubt it. Creating a website can be done by copy pasting a few snippets together and checking if it visually looks like expected.

Good luck with that approach when trying to toy around with models and their training/inference.

There is also a lot of math basics missing that a 12 year old may be able to grasp, but I would bet they are at least 13 by the time the knowledge is deep enough to understand what operations are happening.