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It's a Cervelo with what looks like an Enve wheel, so it makes me think the rider has something to do with team Dimension Data.

Theory 1:

These might be one of the competitive cyclists that have budgets and travel the world in competitions.

Theory 2:

Bikes that are expensive new don't keep their relative value on the used market very well, you can get those pretty cheap.

(Also keep in mind that you are only looking at the mark of the frame, depending on age it might not have many other original parts)

Its a Cervelo S5 that team "Dimension Data fo Qhubeka" was riding few years ago. Let me introduce you to https://en.wikipedia.org/wiki/Amanuel_Gebrezgabihier

Probably they make replica of those bikes? Just like replicas of apparel brands.

Possible. Although you certainly wouldn't want to use a replica carbon fiber bike because they have a very high risk of shattering while in use.