That is certainly true, but as a theological rebuttal, it is meaningless because God has revealed His predestination of all things to us in Scripture. What He keeps for Himself is the reason for His choices other than they are made "according to His good pleasure."
God created time. He created us in time.
There was an absolute point in time that God created the heavens and the earth and all things therein.
THAT is the moment we are talking about. At THAT moment, God "knew" everything that would occur for all time.
And that fact reveals to us that men's destinies are fixed because God has "declared the end from the beginning."
No one is denied faith. All who seek the Lord will find Him. But the ability and desire to seek the Lord comes from the Lord, according to His own purpose in creating men and the world.
Except, according to double predestination, those doomed in the womb are created incapable of this, it is impossible for them - and they will be punished with eternal fire for this incapacity.
And, according to double predestination, those saved in the womb are created incapable of doing otherwise - and they will be rewarded for being created with the inability to do otherwise, just as their brothers and sisters burn for being created otherwise. .