It does.
Jesus is not telling his Father "You are the Only and True Master". Jesus was called Master many times by Jewish monotheists. Jesus accepted and knew He was the Messiah, the Master, the King of Israel, etc. No problem with that. So that was not Jesus's point here.
Jesus is telling his Father "You are the The Only and True God".
The fact that the Person Jesus is speaking to the Person Father and calls Him "The Only and True God", proves that only the Father, and no one else, is God.
Your attempt to invalidate the meaning of "only" in reference to God has been refuted since the Torah and now in John 17:1-3