The problem is that people are using J-references to suggest the original authors used the Tetragrammaton in the Christian Greek Scriptures. This just did not happen. We now have more than 5,000 ancient Greek manuscripts, all of which use Lord or Theos, and none of which used the Tetragrammaton, or even a Greek equivalent. This says something about what the inspired authors were trying to tell us.
The oldest of the ancient manuscripts, or fragments, date back to just 25 years after the death of the author of Revelation. Still no Tetragrammaton. Very few of these ancient manuscripts had been discovered in the 1940s when the NWT was produced.
All the J-references are translations of ancient Greek manuscripts into Hebrew between 1385 CE (mostly 1599CE) until the 20th century. These inserted the Tetragrammaton in place of the original Lord, usually to convince Messianic Jews that Jahweh and Jesus were one and the same. Many of the J referenced make it clear that Jesus and Jehovah are one entity. But the J references are inaccurate translations so cannot be relied on by WTS or Catholics.
That leaves us with over 5,000 ancient Greek manuscripts which predate all J references by more than 1000 years. All these use Lord for both Jehovah and Jesus, whether we like it or not. We can draw our own conclusions.