Is it? Doesn't the "Absolvo te of the Latin Rite demonstrate that the absolution is coming from the priest whereas in the Orthodox formulation it is clear that absolution is from God? This has implications for the fundamental difference between the nature of the grace conferred by the sacrament, created (Latin) and uncreated (Orthodox).
No, it's very clear, at least to the catechized, that any authority to retain or remit sins by the priest is granted under the gospel passage that you quoted. It is true he says the words "I absolve you", but if anyone doesn't understand that the absolution is granted by God then they are poorly catechized. All sin is against God, forgiveness can only come from God.
Now, as to whether the Holy Spirit procedes from the Father AND the Son, on that we'll have to agree to disagree.