The more i learn about this subject , I believe the term lord is suppose to be used because there is not a real distinction between god and Jesus. It’s kind of the theme of the book of Acts.
Plus the book of acts is almost devoted to “ the name of Jesus”.
Plus the Tetragrammaton is often requoted and applied to Jesus in the New Testament.
Also the fact there is no copy of the New Testament containing the Tetragrammaton.