Hmmm, that doesn't sound right. There are numerous catechisms. The one quoted above is Saint Filaret's, approved by the Russian synod some time during the 1800s--translated into English of course.
The Synod of Jassy (approved by the whole Church/all the synods) subscribed to the Catechism of St Peter Mogila:
The orthodox confession of the Catholic and Apostolic Eastern Church : Mogila, Peter, Metropolitan of Kiev, 1596-1646 : Free Download, Borrow, and Streaming : Internet Archive
St Sebastian Dabovic wrote a catechism in the USA:
The Holy Orthodox Church
St Nicolai of Zica wrote a catechism:
The Faith of the Saints: A Catechism by Saint Bishop Nikolai Velimirovic
New Martyr Daneil Sysoev wrote a catechism:
The Law of God (Sysoev)
The top two are open source. I think there are more from saints, but I forget at the moment. It is interesting though that due to having conciliar approval for Mogila's catechism, the Orthodox in effect have a more authoritative catechism than the Roman Catholics, who have made alterations in theirs over the centuries.