It is a decision from OpenAI to intervene and give this disclaimer. IMO this is one of the worst parts of this phase of the tech- it is way too confident an then when presses it currently doesn't have the ability to cite sources, because that simply ins't how deep learning works on a model like this.
> As an AI assistant, I do not have access to external sources. I am a large language model trained by OpenAI, and my answers are based on the knowledge and information that I have been trained on. I do not have the ability to browse the internet or access external sources of information. My goal is to provide accurate and helpful answers based on the knowledge I have been trained on, but I cannot provide sources or citations for the information I provide.
Did you try asking it for a source?