If they're removing all the existing concrete for the driveway it'll simply leave the exposed cable which can simply be concreted over - it's not going to damage it.
Not if they're doing their job properly... Once all the concrete is removed they have to re-level and compact the ground before laying any surface (concrete, asphalt, pavers, whatever).
A load of road-base will be going in (big sharp rocks). Getting finer and rolled, finer, and then rolled.. And if concrete, reo'd.
How do you do this with a fibre running across that's less than 400mm deep?? The moment any sub-base is compacted against any cable/fibre, the cable/fibre will come off worse than a rock.
This isn't a housing slab (even if it is concrete).
Driveways are built to a higher spec.... You're not driving a 2 ton SUV into your lounge every day.
You make a good point.
But from my naive point of view it still sounds feasible and if I was the home owner in this situation I wouldn't have even bothered getting Chorus involved...
1. Manually break up the concrete and cemix around the fibre to ensure its safety.
2. Break and excavate the rest of the concrete driveway.
3. Unearth more of the fibre either side of the driveway to give some slack.
3. Dig a new 900mm deep trench for the fibre to cross in under the new driveway.
4. Lay fibre in trench.
5. (Optional) Obtain 20mm conduit, cut a slit down one side of it it to open it, and put fibre inside conduit.
4. Fill trench in back to ground level.
5. Then apply driveway levelling, stones, compacting and concrete.
But that is a very naive point of view, and more context really would be needed.