This youngster on a townhouse property appears to be low-grafted or not grafted, not top grafted - the trunk runs in a single smooth line. I can't see it at the ground, but from above the water pouch, it has Birch Bark Cherry bark for about a meter or a little more. At that point, some hanging bits of bark reveal a different trunk that is the same for everything from there on up. What is revealed by the peeling bark has the same appearance as the trunk from which are growing branches with leaves that are not Birch Bark Cherry leaves. They look more like Sato-zakura Group leaves, with beautiful hair-tipped marginal teeth. So is there something new on the block, or are vendors covering the trunks of trees with fake bark?
It's a Japanese cherry top worked on a birch bark cherry. This has been done for years. With the main obvious drawback being - as you have pointed out - nothing above the point of union having birch bark.
But not so well-done. And what made me doubt that was that the bark underneath the peeling bit is the same as what continues above it.