The code can crash but it won't often crash your system (unless you use lots of badly tested NIFs, which most people don't), and that's all GP is saying. BEAM isn't magic but it is pretty robust by now.

Tbh I feel like this is not very unique these days, so I'm not sure how this point means a lot, esp in the context of using LLMs for coding. Eg most NodeJS code won't crash your system either (it'll only crash NodeJS).