Yes, WRO believe Eastern Orthodox doctrine.
Most WRO are Antiochians who are former Anglicans - those conservative Anglicans who want to be Orthodox already are coming in: both these and the ones who become Byzantine Rite - which is why they use Anglican-based services.
I slightly know online somebody who worked on the Antiochian BCP, which is still an unofficial book but compiles the Anglican-based services WRO use, which are based mostly on the Episcopal 1928 BCP with the Mass based on the American Missal, a quasi-official book many Anglo-Catholic Episcopalians have used. It's the 1928 Communion service fitted into the structure of the pre-Vatican II Roman Mass.
seabeau, that's often true of liturgically conservative Anglicans but these can be orthodox in doctrine as well as liberal.
What's stopping a lot of Anglicans converting isn't the Real Presence - many Episcopalians are sound on that - but a very different view of the church that is Protestant. Roman Catholics and Orthodox believe in an infallible church; Protestants, even liturgical, sacramental, episcopal ones, don't.