That is a typical scenario of an ornamental pear. It is approx 20 years old and an average life span is around 25 years. They get an over loaded canopy that the wood does not have enough strength to support. Then they fall apart or blow apart, or snow or ice, etc...... These are engineered trees. Nothing is natural about them.
Whatever happened this has already come apart in the first stage (big wound) and the next stage involves the weakened, eventually decayed, torn off flex point falling off again in wind or canopy over loading. At that point it is a stump.
This tree is at the end of the line but no apparent target, so why not just let it run its course? All those red marks equal "topping" no matter what flowery language one uses.
These trees are banned from planting in cities throughout my area including mine.