All oromo??? Unless they lived with them ,like some haraghe and Arsi Oromos,,Other oromos don't know shit about Somalis forget dir..Dir is definitely a real clan. DNA has proven that. The Dir have their own signature haplogroup in the Horn of Africa.
Plus almost all Oromos recognise the Dir clan and acknowledge them. Relations between Oromos and Dir are long as they border eachother.