Well, it's hard to say for sure. Sometimes works have elements of truth mixed with imagination. Maybe Echo is one of those cases where it's not a straightforward true story but has some roots in reality.
Echo 3 is purely fictional. The plot and characters are crafted by the imagination of the creators rather than being drawn from real-life happenings. This allows for more creative freedom and unique storylines.
I'm not entirely sure specifically which 'echo boomers' you're referring to. It could be a movie or a project. If it's a movie, it might be based on real - life events related to the echo boom generation, perhaps their social, economic or cultural experiences.
Most likely, 'Echo 3' is not a true story. Usually, such works are crafted by authors' imaginations to offer an exciting and fictional narrative experience.
'Echo 3' could be a specific entity like a military unit or a group in a story. Since it's based on a true story, it means the events, characters or situations in it are drawn from real - life situations. For example, if it's a movie, the plot might be a fictionalized version of real events that took place.