I wouldn't consider anything implausible at this point.

[ Partly due to their situation, but also, this game seems to be good at implementing aspects that seem beyond comprehension given today's current level of advancement in technology.

Though Albedo isn't about to start claiming someone from the future came to the past to pass along certain information. That's a step too far. ]

Either way, it's not too surprising if there are others like him, or may already be in the process of developing to that extent.