I think he's right. There are three important written sources of information on Orthodox theology and life:
1. The scriptures, especially the Gospels and Psalms.
2. The ecumenical councils.
3. The writings of the saints.
Modern books and blogs are most helpful for enquirers not yet familiar with Orthodoxy, less so for those who are already Orthodox and looking for spiritual guidance.
Edit: not to mention so-called Orthodox blogs are sometimes maintained by schismatics, and one must tread carefully when choosing who to listen to. With the scriptures, the councils, and the saints, there is no such worry.
As someone else already pointed out, Orthodoxy in Dialogue is run by a defrocked homosexual priest. He is himself a schismatic.
At the risk of stating the obvious, he also runs a blog. He is attacking Orthodox blogs from an "Orthodox" blog. If you look through his archives, you'll see that he considers even Fr. Josiah Trenham's views on trannies and women as too radical for him.
Meanwhile, many of the "blogs" these people like to attack, like the one run by Fr. Peter Heers, are run by members of canonical churches in good standing. Fr. Heers even taught at seminaries, like St. Vladimir's.
To repeat, you have an "Orthodox" blog run by a defrocked schismatic, constantly attacking canonical blogs for supposedly sowing division. It's completely absurd.
And there are plenty of saints whose writings would fall under the "conspiracy" and "fear" buzz words pushed by these people. Saint Paisios, for instance, talked about vaccines, secret societies, Zionism, etc. He only reposed in 1994.
To be clear, I agree that people shouldn't get all of their information from blogs; but ironically, it's the people warning about "dangerous" blogs that are the ones that should be most avoided, as they promote obvious heresy.
Things like toll houses, conspiracies, etc. are controversial, but they're debatable and have a basis in the writings of the saints. Things like Origen, homosexuality, BLM, etc. are cut and dry condemned by the Church.