But does this person claim to be late Shah's son??? He might be a nefew, or a 2nd or 3rd cousin, we do not know. It is not impossible.
According to wikipedia, this is the list of children of Reza Shah (father of Reza Pahlavi), all Pahlavis, in total 11 siblings. This person might come from one of them.
EnfantsAvec Maryam Khanum
Princesse Hamdamsaltaneh Pahlavi
Avec Tadj al-Molk
Princesse Shams Pahlavi
Prince
Mohammad Reza
Princesse
Ashraf Pahlavi
Prince Ali Reza Pahlavi
Avec Turan Amir Soleimani
Prince Gholam Reza Pahlavi
Avec Esmat Dowlatshahi
Prince Abdul Reza Pahlavi
Prince Ahmad Reza Pahlavi
Prince Mahmud Reza Pahlavi
Princesse Fatimah Pahlavi
Prince Hamid Reza Pahlavi