The new testament is the realization that Jesus was the visible manifestion of YWHW in old testament. The fire in the burning bush, the cloud rider in the book of Daniel, the fire in the sky in the book of Exodus, the angel of the LORD, the word of the LORD.
The ambiguous use of the tetragrammaton in the new testament is by design, not corruption.
This failure to understand this basic concept is what makes the WTS special in a stupid way.