Seventy-five hundred words in the Thomas Aquinas essay alone? I tried reading it. After halfway through it was so lost in its own philosophy-speak that it lost all meaning. Moses never spoke like that, Jesus never spoke like that, Peter and Paul never spoke like that.
Was that biblical? Seventy-five hundred words and not any of it derived support from scripture. Catholic tradition and philosophical reasoning, yes, but not scripture. I'm not sure how that was supposed to support Trinity being biblical.
I have a different proposal. There is One God. When he spoke to Abraham from the burning bush, he was called "I Am." When he walked among us in the flesh and we knew him not, and we called his name Jesus. When Jesus spoke of God in heaven he was called the Father. When he works invisibly among us in power he is called the Holy Spirit. As a living sacrifice for our sins he is called the Lamb of God. Our God has done many things and used many names. And finally, being the creator of all things he is able to do more than one thing at a time even if it baffles us humans. And as a summation as to his nature and character, God is love.