Are you asking if Siyad Barre directly ordered the attacks against civilians. In that case no, he was not a commanding officer on the field and was not involved in the day to day operations of the army.
What a dumb thing to ask, war crimes are committed under the jurisdiction of the commanding officer of the battalion or brigade. Siyad Barre ordered the SNM to be wiped put. YES did he order General gaani to display captured SNM officers and whip them naked in front of large crowds or any other individual abuses of power? NO