it's according to his humanity, according to which entered to the divine glory He enjoyed according to his divinity from eternity. Henceforth Christ is seated at the right hand of the Father: "By 'the Father's right hand' we understand the glory and honour of divinity, where he who exists as Son of God before all ages, indeed as God, of one being with the Father, is seated bodily after he became incarnate and his flesh was glorified.
Sorry, but that quote from the Catholic catechism is such convoluted and obscure use of language (the parts in italics especially). I usually find trinitarians are reduced to such obfuscatory language as their conception of the trinity is ultimately not reasonably explicable. "Seated at the right hand of the Father" is such a simple scriptural phrase and illustration of the relationship between the two separate persons of the Father and the Son in the heavens, with one as the 'right hand man' of the other (and therefore slightly lesser in status but acting on his behalf and with his authority), yet it's rendered almost unintelligible by that 'explanation' from the 'wisdom' of the Catholic church. (And incidentally look: no third person seated there with them in the form of the Holy Spirit. Why? Because the Spirit is not a person!)
What do you (and they) understand by "divine" and "divinity"?
According to Wikipedia (not always a reliable source admittedly, but it sums up the broad use of this word well): "Divinity or the divine are things that are either related to, devoted to, or proceeding from a deity. What is or is not divine may be loosely defined"
The "divine" can apply to any godlike being or origin, or it can apply specifically only to the one Almighty Creator.
https://www.collinsdictionary.com/dictionary/english/divinity
https://www.macmillandictionary.com/dictionary/british/divinity
What do you (and they) understand by "bodily"? A physical human body? Or a spirit body?
What do you (and they) understand by "incarnate"? That usually refers to a physical, material form.
But flesh cannot be "glorified" (assuming by that one means a human body elevated to heaven) and Jesus cannot be seated at the right hand of God "bodily" in a fleshly sense, if that's what is meant - 1 Corinthians 15:44,50. Philippians 3:21
There is a physical, fleshly body, or there is a spirit non-physical body. Only the latter can enter the heavenly realm, as the scriptures make plain. The angels who forsook their places to have sex with humans in Noah's day could not take their fleshly bodies into the heavens, and nor did Jesus.
Or because these text is not about the Holy Spirit, but about the relation of the Father and the Son. If I talk about my father only in a conversation, it means my mother doesn't exist?
But by the theory of the trinity, the three are co-equal, co-eternal and one in essence, nature, power, action, and will, No humans have such a relationship to one another. So why not even a hint of the presence of the third 'person' in this unity of three-in-one? And this is not the only scripture where there are only two persons - not three - linked in the prominent positions and relationship.
Matthew 11:27 - "no one knows the Father except the Son and those to whom the Son chooses to reveal him." (but not the Spirit)
etc, etc...