Almost all scholars agree this verse was added to the…

Almost all scholars agree this verse was added to the scripture.

“For there are three that bear record in heaven, the Father, the Word, and the Holy Ghost: and these three are one.”
‭‭1 John‬ ‭5:7‬ ‭KJV

Is it safe to say that someone who added this verse to support the idea of the Trinity is a heretic?