Unless Austin has an option for an additional year, his contract runs out in the summer.
Agree, and Whiteman has a contract to June 2025.
So pretty sure one of them will be 3rd GK next season. Club trained GK, alternative is to use an overseas trained or 'Trained by other club affiliated to The FA or FAW' place, both categories we can usefully used for other players.
My guess is Austin and or Whiteman stays until Gunter is ready - which might be 3 or 4 years !