The neoplatonic cosmology has little in common with the Christian understanding of a Triune Deity although certain groups of Gnostics derived their thought heavily from Neoplatonism and attempted to tie this to Christianity. They’re not the only ones to attempt to co-opt Christian theology - black legends have attempted to tie the Trinity to some set of three deities from pantheistic religions such as those practiced by the Egyptians and Greeks. The most common one known today is from an obscene text by Hislop that was intended as an indict of Catholicism but would also undermine Christianity in general.
Let’s examine the key differences between our understanding of the Trinity and the Neoplatonic understanding of Divinity:
The Trinity is One being, eternal and personal, revealed to humanity in three persons, the Father, the Son and the Holy Spirit. Though of the same substance and eternally co-existing, each Person is revealed to us in distinct fashion - for example Scripture describes the Father as Creator, the Son as Redeemer and the Holy Spirit as Advocate. These aren’t exclusive definitions because each is one in being with the other, and Scripture also speaks of Jesus as interceding on our behalf (an advocacy role), and we pray to the Father and Spirit alike for our salvation as well as to the Son.
To contrast, Neoplatonism posits that there is The One who is pure being and impersonal, and unlike God who is Love, The One is simply the totality of the essence being such that all lesser beings are less substantial. Already we see this concept does not describe God our Father who loved us before all Creation.
You mention the nous as being described as like the Son, but the reality is these two are very distinct. The nous is like The One in image but entirely different in substance, whereas the Son and the Father are One, of the same substance and being. And again, the nous is impersonal, stationary and the embodiment of energy. Remember that we are created in the image and likeness of the Father, and the face of the Son is not unlike our own. Jesus Christ, as true God and true man, possesses a human soul and a glorified body. This is nothing like the impersonal (non-person) nous.
What is the website you visited? It is not at all uncommon for errant deviations from Catholic teaching to be presented online - whether by non-Catholic or non-Trinitarian Christian faiths, or by non-Christian faiths that will grasp at any possible means to undermine the Truth of Revelation in the minds of the people of God. The only possible link I can think of to such philosophical dribble is in the language that Paul often employs when evangelizing the Greeks. Note that Paul’s wording and style differ if he is addressing Greek or Jew, partly because of distinct backgrounds - the Jews were familiar with Scripture so that appeals to Scripture are effective, whereas the Greeks held to their own distinct philosophies (Neoplatonism among others) such that Paul’s approach was necessarily distinct.
