Perhaps the gap in the discussion is that Hyundai Motor Group is a big chaebol and seemingly is involved in many things: https://en.wikipedia.org/wiki/Hyundai_Motor_Group

Considering that, either of two things would be sufficient for them to make general purpose robots:

* It will be one of their numerous business lines and provide substitutable labor for the others, not all of which are in car construction

* Considering they are in things from credit cards to railways to steel, they would like to add a new product line of selling robots to other customers

None of this is outrageously out of line. Various companies start with some business lines and end up with others. This is particularly common in Korea where Samsung wasn't always a semiconductor company. Hyundai themselves were in construction first. Closer to home, Amex was a logistics company. These things happen. Perhaps you are familiar with Softbank which was a PC software publisher and is now an investment company.