“He derives this doctrine from the doctrine and example (practice) of the early church, which was informed by the instructions of the Apostles and the guidance of the Holy Spirit”
Except there is zero evidence any Apostle taught this.
You are calling something “the early church” to avoid saying it was believed hundreds later.
If you doubt sources like St. Justin Martyr, St. Jerome, and the first regional synods and Ecumenical Councils, you really have no reason to accept the veracity of the Bible, which was penned, collated and put in your hands by these very same churchmen.
Some more recent commentators, of course, have a puny view--- if not an outright hostility --toward the church of the 2nd, 3rd, 4th centuries (and therefore, logically, of the canonical Scriptures they handed on to us.)
You see it all the time in the writings of Muslims and feminists, interestingly enough: a completely penetrating hermeneutic of suspicion.
The whole writing of Scripture was not complete until almost the end of the First century (Revelation of John.) Please keep in mind that the most important cultural artifacts of the 2nd+ centuries of the Christian Era was the collection and canonization of those same Sacred Scriptures. This is, beyond dispute, one of the most important elements of Apostolic Tradition.