If you reviewed 
the debate in question, you would know that the doctrine of the Trinity makes no such claim. Therein you will find:
...confusion lies in confusing 
ontology and 
distinctions with respect to the Godhead. Ontologically, there is no difference between the Father, Son, and Holy Spirit. 
The Father, Son, and Holy Spirit are not three, separate, divine essences (or beings). The Father, Son, and Holy Spirit are co-equal, co-participants of the one divine essence. When speaking of the Godhead in formal theological terms, we would properly say that the Father, Son, and Holy Spirit are three personal 
subsistences of the one, divine, essence.
 
The 
essence of something is that something’s 
being. In the Greek, the word is 
ousia. The word 
essence has its root in the Latin, 
to be. When speaking of God, the question arises as to how God’s 
essence makes its existence known, for God is more than having 
being or 
existence. Indeed, 
God is being , for He declared this to be so to Moses in Exodus 3:14-15:
 
14 And God said to Moses, “I AM WHO I AM .” And He said, “Thus you shall say to the children of Israel, ‘I AM has sent me to you.’ ” 
15 Moreover God said to Moses, “Thus you shall say to the children of Israel: ‘The LORD God of your fathers, the God of Abraham, the God of Isaac, and the God of Jacob, has sent me to you. This is My name forever, and this is My memorial to all generations.’
 
In the passage above (see also John 5:26; Acts 17:24-25) God declares His self-existence (
aseity), importing a boundless, ineffable, absolute, and transcendent being.
 
If we study in Scripture aspects of the composition of God’s essence, that is, His 
nature, several important attributes of God’s nature emerge:
http://www.theologyonline.com/forums/showthread.php?p=1532973#post1532973
How does essence make its existence known? ...We look to Scripture to learn how the essence of God 
exercises existence, that is, how the essence of God 
subsists. When something really exists we say this something possesses 
subsistence. And when we speak of the characteristics of the Father, Son, and Holy Spirit, we are speaking about the individuated subsistences of the Father, Son, and Holy Spirit. These subsistences do not divide the essence of God. God’s essence is common to the three subsistences, each possessing the essence as one undivided nature—‘
as all the fullness of the Godhead dwells in Christ’, so in the Holy Spirit; and of the Father.
I do not think you understand "it" at all.
AMR