Did I just buy a diseased tree?

last month

Today I purchased this Bihou Japanese Maple locally from a nursery with great reviews especially regarding their Japanese Maples so I just assumed all is good and that the discoloration is normal. I planted it today and while reading more about this lovely tree I stumbled upon some negative information this cultivar and wonder if I was sold a sick tree? Could it infect other Japanese Maples? Is there anything I can do? The top of it looks healthy. I went out there in the dark to get a better look at it. It's right above the graft .

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