Notice how it makes pouring the exception? The Orthodox Catholic Church accepts pouring baptism and even sprinkling baptism as valid but illicit except in cases of emergency or where immersion is impossible. The Church Fathers repeatedly speak of baptism being done normally by immersion:
"After His resurrection He promises in a pledge to His disciples that He will send them the promise of His Father; Lk. 24:49 and lastly, He commands them to baptize into the Father and the Son and the Holy Ghost, not into a unipersonal God. And indeed it is not once only, but three times, that we are immersed into the Three Persons, at each several mention of Their names." (Against Praxeas 26, Tertullian)
…[Y]ou were led to the holy pool of Divine Baptism, as Christ was carried from the Cross to the Sepulchre which is before our eyes. And each of you was asked, whether he believed in the name of the Father, and of the Son, and of the Holy Ghost, and you made that saving confession, and descended three times into the water, and ascended again; here also hinting by a symbol at the three days burial of Christ. For as our Saviour passed three days and three nights in the heart of the earth, so you also in your first ascent out of the water, represented the first day of Christ in the earth, and by your descent, the night; for as he who is in the night, no longer sees, but he who is in the day, remains in the light, so in the descent, as in the night, you saw nothing, but in ascending again you were as in the day. And at the self-same moment you were both dying and being born; and that Water of salvation was at once your grave and your mother. (Catechetical Lecture 20: On the Mysteries 2.4, St. Basil of Caesarea )
This then is what it is to be born again of water and of the Spirit, the being made dead being effected in the water, while our life is wrought in us through the Spirit. In three immersions, then, and with three invocations, the great mystery of baptism is performed, to the end that the type of death may be fully figured, and that by the tradition of the divine knowledge the baptized may have their souls enlightened. It follows that if there is any grace in the water, it is not of the nature of the water, but of the presence of the Spirit. For baptism is not the putting away of the filth of the flesh, but the answer of a good conscience towards God. (1 Pet. 3:21) (On the Holy Spirit 15.35, St. Jerome)
In Baptism are fulfilled the pledges of our covenant with God; burial and death, resurrection and life; and these take place all at once. For when we immerse our heads in the water, the old man is buried as in a tomb below, and wholly sunk forever; then as we raise them again, the new man rises in its stead. As it is easy for us to dip and to lift our heads again, so it is easy for God to bury the old man, and to show forth the new. And this is done thrice, that you may learn that the power of the Father, the Son, and the Holy Ghost fulfills all this. (Homily 25 on the Gospel of John, St. John Chrysostom)
For the Apostle Paul says, ‘Know ye not, that so many of us as were baptized into Jesus Christ were baptized into His death? Therefore, we are buried with Him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we should also walk in newness of life. For is we were planted together in the likeness of Hid death, we shall be also in the likeness of His resurrection.’ And the teacher of the Gentiles stated this idea in other and fuller language, when he wished to recommend the sacrament of baptism. So that it appears from the spirit of his doctrine, that that day and that time has been chosen for baptizing the sons of men, and for making them the sons of God, in which, by a likeness and by the mode of administering the sacrament, those things which are performed upon the members may correspond to those which have been performed upon the Head; for while, in accordance with the rule of baptism, death intervenes by the dying unto sin, and while the trine immersion is an imitation of the three days’ burial, the rising again out the water is an image of Christ rising from the grave. (Letter 16.4, Pope St. Leo I)
Much more than this too.