If you mean in 2021, the first episode will come out then sure, if you mean ep 1 + ep 2 + ep 3 will come out in 2021 the nope. All parts of FFVIIR contain: Before Crisis, Crisis Core, the main game, Dirge of Cerberus and Advent Children. No way the full game can come out in 2021, ep 1 at best.
Source for FF VIIR including Before Crisis, Crisis Core, Dirge of Cerberus, and Advent Children ? Because I certainly haven't heard of the remake including any of these titles within the chronology ...