Santiago Gimenez disallowed goal vs Costa Rica

I'm a relatively new referee working on my offsides game and am curious what you guys think of this decision.

I can see both sides, ultimately I think its 50/50 on whether you think its a valid play of the ball by the defender. He didn't really get possession of the ball but he definitely intended to clear it or get it out of there by heading it, which is what he did.

In real time I think my first instinct would be to give a goal.

Im assuming offside is the objectively correct call.