Is this fungal?

We have two....this is the good one, but does get the brown leaves. So I pick up all the leaves which is hard work.

   

We have another one that is the same size around the other side of the house. We have had to get a tree surgeon to cut branches out. It is going hollow now. I have a friend that is an arborist and he can check the tree health on the  inside -amazing kit.  He pierces the trunk with what looks like a long needle /super long piece of metal that he drills into the trunk ( it's super thin) this produces a document giving the density of the wood inside etc. Sadly mine has deteriorated year on year. We can't afford to cut it down at the moment but it will be coming down soon. We had remedial work done on it last year. We have taken out lots of the old dangerous wood out over the years.