You assume that someone actively checked that. We know for a fact that legislators routinely don't actually read the bills they approve, and a disturbing amount of the time issues are found after things are signed into law because they didn't actually read the damned things in the first place.

He also claims he asked ChatGPT because he needed the definition of deepfake. So instead of going to any number of dictionaries where definitions are located... He asked an LLM AI that has been proven to provide false information, to generate an answer. And then kept that fact a secret.

The fact he admits that he purposefully kept the ChatGPT use a secret until after it was signed into law proves that he knew it was at least a shady idea. It doesn't matter whether it actually made a difference, that shows a disturbing lack of ethics.

We have apparently evidence that he doesn't know what a dictionary is, or how to find one, even online. And a willingness to use tools he doesn't understand to generate laws everyone will be bound by. From his actions here we have shown a pretty clear lack of proper ceitical thinking and ethics.

If you can check that it's correct, then you can research the topic well enough to know what should be in it, which means you can just write the damn thing yourself.

They aren't too dumb and lazy to check it, but they are dumb and lazy enough to ask something else to write it for them. That is a highly specific amount of dumb and lazy.