Sounds OK to me. Keep it in the shade for the next month or so to give the roots time to establish new feeders. Al

Cutting back top growth when you transplant or root prune to offset root loss is kind of an old school concept that has lost favor by most horticulturists. It is the top growth that provides energy to the roots for rapid regeneration, even more so with evergreen plants like rosemary, so cutting back the top growth should be minimized. OTOH, rosemary is a pretty tough plant and frequent pruning for culinary purposes doesn't faze it so I would not be overly concerned about your cutting back the top. However, you should not need to do any further top pruning at this point.

A timely post as I need to do the same thing to my herb planter. How exactly do you root-trim? I have literally had people telling me to do this in this forum for two years or so to this rosemary, but taken the denial approach (ignoring the thing) because I have no idea how to do that.