Saying it lacks access to data is a severe oversimplification. The LLMs themselves are data. Saying that it lacks access to data also implies the data it lacks exists.
If an LLM were installed on a system with cameras and robotic arms it will never be able to make tea. It can probably tell you how tea is made, but it doesn’t know how to do it itself. It won’t know how to move the arms or process images from the cameras or identify and manipulate objects. It wasn’t designed to do that and is unable to adapt itself to the situation. LLMs are designed to regurgitate statistically likely text phrases.