Leylandii Advice Please

I moved into my house five years ago and have watched my neighbour's Leylandii hedge widen above the fence at the end of my garden. I gained his permission to have it pruned back and duly employed someone advertising in our local Parish Magazine to do the work. My neighbour came to have a look, only to tell me it had been cut too far into the wood and will never grow back. The chap who did the work tells me it will - who is right?
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Not a problem for your neighbour, who won’t have to look at it, as the rest of the tree will continue to grow normally.
Plant something on your side of the fence that can grow up to block the view of the leylandii. Photinia red robin or privet might be options or if you have less spare garden space a trellis and an evergreen climber might be worth considering.
The RHS information page on photinia red robin says they grow to 2.5 - 4 metres ultimate height which is about 7 - 12 foot but since they would be closer to you than the Leylandii they might still cover most of the eye sore facing you. Another source I found claims it can grow to 5metre or 15foot tall. Laurel hedging or holly might be options if you want something taller and hornbeam also can be kept to a restricted depth and still grow tall.