Back pay isn’t guaranteed, and Congressional leadership has gone back and forth about whether back pay is owed. I would put money on any back pay being partial at best. (I understand that this is waste, fraud, and abuse that is being cut?)
But yes, this is bullshit. We also should not have active duty military using soup kitchens abroad. But on these matters, my opinion is obviously different from that of most voters. Hopefully, voters will change their minds.