That is wrong, NKJV uses the Pierpoint "Majority Text" that has only about 1,000 insignificant difference with the Textus Receptus:
As for Judas, in the understatement of the century Jesus said "it had been good for that man if he had not been born."
The Son of man goeth as it is written of him: but woe unto that man by whom the Son of man is betrayed!
it had been good for that man if he had not been born. (Matt. 26:24 KJV)
That's not true if Judas goes to heaven instead of hell.
You wrongly believe Judas paid for the life he took, when he took his own. That contradicts everything we know about Christ. Its because Jesus is God the Son, His sacrificed life can cover the sins of everyone born, if they believe of course.
So Judas' human life cannot pay for taking the life of Jesus.
If Judas repented instead, and plead for mercy its possible some of his punishment might have been removed, but he was still guilty of an eternal sin and there is no forgiveness for that.
By taking his own life, he lost that chance to be under the New Covenant and not the Old.
Another proof Judas is in hell, is the name Jesus called him "son of perdition" and declares him "lost":
"While I was with them in the world, I kept them in Your name. Those whom You gave Me I have kept; and
none of them is lost except the son of perdition, that the Scripture might be fulfilled. (Jn. 17:12 NKJ)
You err greatly, Judas is "lost", not saved.
So is the Beast:
Let no one deceive you by any means; for that Day will not come unless the falling away comes first, and the man of sin is revealed,
the son of perdition, (2 Thess. 2:3 NKJ)
"Son of" is Hebrew idiom for "of that". "Son of perdition" is similar to "child of hell" (Mat. 23:15), Judas and the Beast are "of perdition" which means it is certain "perdition" is their final state. Perdition spawned him, perdition will consume them.
"Destined for the Lake of Fire", just like the Beast:
And the devil that deceived them was cast into the lake of fire and brimstone, where the beast and the false prophet are, and
shall be tormented day and night for ever and ever. (Rev. 20:10 KJV)