What do you mean "self-appointed"? He randomly woke up one day and choose to call himself the Suldaan of HJ? Why would he be invited to the inauguration of Beeldaaje if that were the case?
The title of Suldaan and Chief Caaqil are legal titles in Somaliland. Similar to your Garaads. However the title of Boqor is not of any legal consequence, so he can call himself the Boqor of HJ but not the Suldaan, as the government can only recongize one Suldaan of each subclan at a time.
He was invited probably because he is close personal friends with Abdiwali Gaas.