Although Peugeot Citroen belongs to PSA Group, Peugeot and Citroen operate independently, and the rear wheel follow-up steering technology is a patent of Citroen, so Peugeot cannot be used.
Having said that, BMW paid for this patent, so I privately think Peugeot can also use this technology by buying Citroen's patent, and it seems that the money only goes from the left pocket to the right pocket, but after all, there are also tax problems. Paying from the left pocket to the right pocket is a pile of taxes for no reason. Moreover, Peugeot and Citroen are different, so it is not necessary to use all technologies at the same time.
In addition, Peugeot 206 has no rear wheel follow-up steering, but it has more stabilizer bars than Elysee.