He never said all the dead at the same time. Sorry.
He implies that in the strongest possible language.
2Tim 4
I solemnly charge you in the presence of God and of Christ Jesus,
who is to judge the living and the dead, and by His appearing and His kingdom:
2 preach the word; be ready in season and out of season; reprove, rebuke, exhort, with great patience and instruction.
3 For the time will come when they will not endure sound doctrine; but wanting to have their ears tickled, they will accumulate for themselves teachers in accordance to their own desires, 4 and will turn away their ears from the truth and will turn aside to myths.
5 But you, be sober in all things, endure hardship, do the work of an evangelist, fulfill your ministry
6 For I am already being poured out as a drink offering, and the time of my departure has come.
7
I have fought the good fight, I have finished the course, I have kept the faith;
8 in the future there is laid up for me the crown of righteousness, which the Lord, the righteous Judge, will award to me on that day; and not only to me, but also to all who have loved His appearing.
I understand the above verses to be saying that the Lord will judge the living and the dead when he appears.
When he appears the righteous , whether living or dead , are rewarded with a glorious crown.
As for the unrighteous living and dead, they will have to give account for their rejection of God and his saving Gospel....,
1Pet 4
4 In all this, they are surprised that you do not run with them into the same excesses of dissipation, and they malign you; 5
but they will give account to Him who is ready to judge the living and the dead.
6
For the gospel has for this purpose been preached even to those who are dead, that though they are judged in the flesh as men, they may live in the spirit according to the will of God.
7 The end of all things is near; therefore, be of sound judgment and sober spirit for the purpose of prayer. 8 Above all, keep fervent in your love for one another, because love covers a multitude of sins. 9 Be hospitable to one another without complaint.
They are seen to give an account in Matt 25, when the Lord comes in Glory to take his seat in judgment. Doesnt end well for them.
He throws them into the place of eternal punishment prepared for the devil and his angels.
We are solemnly charged to testify to the world this fact.....that Jesus is coming to take his seat as judge of the living and the dead when he appears.
The judge is already standing at the door ready yes, according to James.
God has indeed fixed a day, an hour, when he will judge the world in righteousness through the Lord Jesus Christ whom he raised from the dead.
Matt 16
Jesus said...,
27 For the Son of Man is going to come in the glory of His Father with His angels, and will then repay every man according to his deeds.
Every man whether living or dead will be repayed when he comes.