Where is the Evidence for This Claim?

And what does it do to the Bible, overall?

This is a screen shot from a YouTube video that claims such things as YHWH (or Jehovah) "appears in the Christian Greek Scriptures but was quickly removed and replaced with ky'rios or The-os (God, Lord*).

This is a massive claim. It means that before the New World Translation was published in the 1950s, all Bibles were corrupt. But where is the actual evidence that YHWH (or Jehovah) was "quickly removed" from the original Greek copies of the Gospels and epistles? And where is the evidence that Paul, Peter and the other evangelistic apostles taught Gentile Christian converts a Hebrew name for God when they spoke so frequently about the Lord Jesus? The Greek language is massively different from Hebrew. Do Jehovah's Witnesses honestly expect us to believe that when Paul wrote his epistles he inserted four Hebrew characters into his Greek text rather than simply use the Greek word kyrios, as is found in the extant Greek manuscripts?

And what about the apostles Peter and John? Between their 5 letters they mention YHWH (or Jehovah) not once! If the four Hebrew letters were used so frequently among 1st century Christians, whether of Hebrew descent or Gentile, why didn't these two faithful followers and witnesses of Christ use them in their letters?

The reality is that the Governing Body has infused an obsession with the name Jehovah into all Jehovah's Witnesses. But the evidence found in the Bible points to the name Jesus as being the most important name in the universe - literally in heaven and on earth. The name Jesus is the name that brings salvation to men, not the name Jehovah.

If the name Jesus is the most important name, who has inspired the Governing Body to put such an overwhelming evidence on the name Jehovah?

* actually, it's the other way around; kyrios = Lord and theos = God.