Normative baptism and conversion in the Orthodox Church
Normatively, this assumes you were not baptized into the Orthodox Church as an infant or long before.
And why convert if you are already part of the church, the body of Christ?
Normatively affirming baptisms performed outside the church undermines our ecclesiology. Making oikonomia the norm rather than a temporary measure destroys akriveia.
What is the church? Were these people already baptized into the Orthodox Church? No. They are not part of the church. The exceptions, oikonomia, do not make the rule. Historical context for all of this is vital. Read "On the reception of the heterodox into the Orthodox Church: The Patristic consensus and criteria".
You cannot quote-mine because the exact opposite will come back and bite you. Hardly anyone outside Orthodoxy even keeps the form anymore. This is not Donatist. These people performing these acts are not part of the priesthood. Lord have mercy. Actually read the book.