Yes, it is. If I say I am the Gatekeeper, and someone decides they do not like that and they add an “A”, to make it "I am “a” Gatekeeper, " then they totally rewrote and changed the meaning of what was written.
The Insertion of “Jehovah” in the New Testament. One of the most frequent changes is the placement of the name Jehovah into the New Testament (237 times). The existing Greek manuscripts of the New Testament use the words Kyrios (Lord) and Theos (God), but never the Tetragrammaton (YHWH).
The JWs argue they are restoring the name where they believe it was originally. However, this changes the meaning by creating a sharp distinction between “Jehovah” and “the Lord (Jesus)” in verses where the original Greek might have intended to link the two.
The NWT has specific renderings for verses that traditionally support the deity of Christ. John 1:1: While most versions read “the Word was God,” the NWT reads “the Word was a god.” This shift from a nature (divinity) to a classification (a secondary god) fundamentally changes the orthodox understanding of the Trinity.
Colossians 1:16-17: The NWT inserts the word “[other]” several times (e.g., “all [other] things were created through him”). The word “other” is not in the Greek. Its insertion suggests that Jesus himself was a created being who then helped create everything else, rather than being the uncreated Creator.
Because ancient Greek manuscripts lacked modern punctuation, the placement of a comma can drastically change a verse’s meaning. Luke 23:43: Traditional: “Truly I tell you, today you will be with me in Paradise.” (Suggests immediate consciousness after death).NWT: “Truly I tell you today, you will be with me in Paradise.” (Moves “today” to the time of the statement, allowing for the belief in “soul sleep” or a future resurrection).
The NWT is known for being very “lean.” It removes verses or phrases that are widely considered by modern scholars to be later additions to the original text (interpolations). The Johannine Comma (1 John 5:7-8): Like most modern translations (ESV, NASB), the NWT removes the explicit reference to the Father, Word, and Holy Spirit being “one,” as it does not appear in the oldest manuscripts. They often place the end of Mark 16 in brackets or separate it, noting that the earliest manuscripts end at verse 8.
Peter