People who say ChatGPT is going to replace Google are not very competent at expressing themselves when it comes to this topic. However, their general idea is right. ChatGPT isn't gonna replace Google because ChatGPT can't do what Google does. Period. It was also not designed for it.
What may be replaced is, not google, but the TRADITIONAL SEARCH ENGINE MODEL, which hasn't been properly updated in decades. ChatGPT won't be the one replacing it though. It will be replaced by some other AI tool that doesn't exist yet. And it's more likely that tool will be created by Google itself than by anyone else.