“Customizing” is just dumping more data in to it’s context.
Yes, which would fix the incorrect coding issues. It’s not an llm issue, it’s too much data. Or remove the context causing that issue. These require a little legwork and knowledge to make useful. Like anything else.
You really don’t know how these work do you?

kinda like if I would point out people shouldn’t engage with you since you’re an aggressive troll.
The article clearly mentioned they weren’t experienced with AI, that’s the new tool.