It didn’t “lie,” because an LLM can’t deceive. It’s a tool that predicts the next most likely token, and unless you asking for citations you’re using an LLM in an application where they do not usually perform well

I gave it a try on a hobby project without double checking. I bought some parts I didn't need. Good thing it was only about $20.

In hindsight a good portion of the diagrams I asked for were complete non-sense, but I wrote it off as poor image generation than having zero actual comprehension. It was trying to generate designs that didn't exist because nobody does it that way. I later figured out after looking at diagrams from research papers where students built much simpler designs.