For others who’ve already done their Biometrics but are now in this weird “Awaiting application submition” state…
fwiw, our lawyers looked at that AIMA email today, and said:
…you have already submitted all the documents required and duly updated at the day of the appointment for the biometrics. Therefore, we are now at the final stage, just missing the final approval and the payment of the remaining fees. The notification does not apply to your case.