Might have been nailed by winter cold.

yep looks like a classic presentation of winter burn.

For 2 years in the ground I would have expected a known hardy clone to do a *little* better. My 'Shalimar' in far northeastern MD was slightly injured in PV-1, not at all in PV-2 IIRC, and not at all in the most recent PV-3. Only difference might be that mine has some winter morning shade. Hopefully the nursery sold you one of those known hardy varieties and not just a seedling.

It will recover but an arborist isn't going to be able fix the fact you don't have a hardy one, if you don't. Southeastern PA could mean zone 7b to zone 6b or even 6a in the coldest frost hollows at elevation.