That is always a tough one. Many times, when I see green, the stems fail to leaf out. Not 100% of the time but a lot. So if I was you, I would assume they will not leaf out, I would prune them down and move on. The reason is that, if a handful of them were to leaf out, you would end with a weird looking shrub... a handful of long stems leafed out and, at the bottom of the shrub, some leaves/stems also coming from the base.

You can usually tell if you are going to get leaf out by the end of May but in your picture, it sure does not look like it will start any time soon. I was hoping one or two places with leaf out for example and more later on but it is quite bare.

I would assume that any invisible flower buds near the end of the stems got zapped too. If this one is a rebloomer, it should bloom from the new growth but it would do it later on, in the summer months or thereabouts.

I assume that the winter protection was insufficient. Try using more leaves packed to protect the ends of the stems, which is where the invisible flower buds develop. Allow several inches between the end of the stems and the end of your cage or top of the cage. If you do not have enough leaves, try using mulch instead of leaves.