The reason it didn't have math from the start was that it was a solved problem on computers decades ago, and they are specifically demonstrating advances in language capabilities.
Machines can handle math, language, graphics, and motor coordination already. A unified interface to coordinate all of those isn't finished, but gluing together different programs isn't a significant engineering problem.
is quality of this system good enough to qualify for AGI?..
By your own explanation, the current generation of AI is very far from AGI, as it was defined in GP.