Just because they've implemented something that helps in a certain area doesn't mean they'll always get it right.
I think you'd struggle to find anywhere Google claims to "understand everything", making your assertion a strawman.
Literally in the article you're quoting from Google:
> But you’ll still stump Google from time to time. Even with BERT, we don’t always get it right. If you search for “what state is south of Nebraska,” BERT’s best guess is a community called “South Nebraska.” (If you've got a feeling it's not in Kansas, you're right.)
I think you'd struggle to find anywhere Google claims to "understand everything", making your assertion a strawman.
Literally in the article you're quoting from Google:
> But you’ll still stump Google from time to time. Even with BERT, we don’t always get it right. If you search for “what state is south of Nebraska,” BERT’s best guess is a community called “South Nebraska.” (If you've got a feeling it's not in Kansas, you're right.)