That is a big possibility. However, since the Lord has not told us this is Satan, we gain nothing by insisting that he is. The important thing is not his precise identity (beyond what the Spirit has revealed), but instead that this king over the hordes of the bottomless pit must do the will of God.
11 Elles avaient sur elles comme roi l'ange de l'abîme, nommé en hébreu Abaddon, et en grec Apollyon.