When one reads the recorded Patristic Writings of a Church, one discovers what that Church's Fathers actually believed.
After all, they have no particular reason to lie about what they are expressly teaching their Flock.
Because the link deals with the Orthodoxy in the English i.e. Anglo-Saxon tradition.
With that said - it is not suprising that the Anglo - Orthodox/Catholics would not quote much from the Celts as per this article: How separate was the Celtic church?
It is easy to exaggerate the cohesiveness of the Celtic Christian communities. Their members never saw themselves in opposition to the Catholic establishment based on Rome as did the Arians, Priscillianists or the Donatists in North Africa. Even at the height of the conflict between these communities and other Christian groups, they acknowledged the supremacy of the Pope and acquiesced to his specific commands.
On the other hand, these communities did see themselves as separate from their competitors, the Anglo-Saxons. An early Welsh ecclesiastical rule levied penalties for interacting with the English, and for sharing communion with them. When St Augustine attempted to meet with a delegation of seven British bishops on the borders of the domains of Ethelbert of Kent, these bishops refused to talk or even dine with his party; and when Aethelfrith of Northumbria went to battle with Solomon, son of Cynan, king of Powys, hundreds of British Christian monks are said to have assembled to pray for the Venedotian king. It is noteworthy that the British failed to attempt to convert the Anglo-Saxons, and that the successful Celtic missions had come from further away, from the Dalradian Scots.