Yes, that is exactly what He meant. The three (Father, Son, and Holy Spirit) are “ONE”.They are not separate entities. The definition of the Trinity is: God is one God, but three coeternal consubstantial persons or hypostases—the Father, the Son (Jesus Christ), and the Holy Spirit—as "one God in three Divine persons". The three persons are distinct, yet are one "substance, essence or nature".
Don’t you, as a Catholic say the Nicene Creed? (just as many of us Protestants do)...... I am pretty sure you do.
They are three persons in one divine nature.
Apple -- the Nicene Creed is a perfect example of why you cannot club yourself with the others on this thread -- there are those who call themselves "Protestants" but reject aspects of the Creed and others say they don't want to say it.
you don't have even that in common with them. That's why I reject using the term "Protestant" - it's describes too broad a group of contradictory beliefs