The question is about the Historic Future. The narration is in the Past Simple (events of 1953). So, can "будет расстрелян" be translated in the Future Simple, like "Omnipotent Lavrentiy Beria was arrested as the «Enemy of the Nation (people)» in the summer of that year, and in December he will be executed/shot." The question is addressed, first of all, to you know who )).