Not true.
Other translations say what the KJV says (ASV, CSB, HCSB, NKJV, and RSV).
Some weaker translations add "practice".
You are only as effective as the tool you use.
So you are saying that the NASB is an unreliable translation? Our English translations are translated from Greek. Other translations say:
AMP - No one who is born of God
[deliberately, knowingly, and habitually] practices sin, because God’s seed [His principle of life, the essence of His righteous character] remains [permanently] in him [who is born again—who is reborn from above—spiritually transformed, renewed, and set apart for His purpose]; and he [who is born again]
cannot habitually [live a life characterized by] sin, because he is born of God and longs to please Him.
AMPC - No one born (begotten) of God
[deliberately, knowingly, and habitually] practices sin, for God’s nature abides in him [His principle of life, the divine sperm, remains permanently within him]; and he
cannot practice sinning because he is born (begotten) of God.
CEB - Those born from God
don’t practice sin because God’s DNA remains in them. They can’t sin because they are born from God.
ESV - No one born of God
makes a practice of sinning, for God's seed abides in him; and he cannot keep on sinning, because he has been born of God.
ISV - No one who has been born from God
practices sin, because God’s seed abides in him. Indeed, he cannot go on sinning, because he has been born from God.
NET - Everyone who has been fathered by God
does not practice sin, because God’s seed resides in him, and thus he is not able to sin, because he has been fathered by God.