Hi there - difficult to say whether your "red robin" will survive - perhaps, plant it anyway with well rotted compost in a sunny site and wait to see what happens during the next few months.
We have several of these and grow them in hedging, specimen shrub, small shrub and small tree !! Which it is depends on whether it's me or my husband doing the pruning !!!! I grow one as a small shrub and prune different shoots to a leaf node throughout spring, summer and early autumn to maintain the red leaves. A friend advises to prune after a full moon as apparently the plants can tolerate the loss of limb/leaf better at this time of the month. The next full moon is 3rd July so I'll be busy then !!!!