I’m sure you know that you’ve also stated the view of many orthodox protestant churches.
Strictly speaking, the Orthodox churches (i.e., Russian Orthodox, Greek Orthodox, etc.) are not protesting any doctrine (they differ on which, if any patriarch is the supreme pontiff) and are therefore, not protestant. The Orthodox churches enjoy Apostolic succession and, consequently, partake of the true body, blood soul and divinity of Jesus Christ when they take Eucharist.