The adjective "Greater" describing a country, a nation, a people, is what we call fascism in political science.
The guy also echoes what others here and there are saying, "Tigray territory is not enough for Tigray people"
When a country, a nation, a people start thinking that its geographic territory is not enough for its people, "lebensraum" as Greater Germany used to call it, it is a recipe for self-imposed disaster. Ask Serbia, Germany, Somalia, three countries with a recent "Greater" prefix to their name.