I didn’t say the tree was dead, I said it had dry rot.
Holes - Internal decay
Internal rots and trunk decay are serious conditions that weaken the trunk, branches and roots. They can make a tree or branch hazardous. They usually develop slowly from wounds and in time can hollow out a trunk or branch causing it to fail. Dead branches, peeling bark and a hollow sound when a tree trunk is thumped can all be signs of internal decay. These require a professional evaluation.