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.
Yes, in 'echo 3 true story', 'echo 3' is likely related to the 'true story'. It could be the name or identifier for the events that make up the true story.