In the TV series, In Search of Perfection, he goes the extra mile to figure out a way to reproduce the recipe in reasonably well equipped home kitchens. One of the many tricks is that having salt in the blanching water is mandatory. It helps to create the porous surface. His recipe is so good I can make delicious chips at home even without access to a temperature controlled fat fryer.
(Incidentally, Jamie Oliver blanches whole skinned potatoes before roasting them in the oven. I've tried that too and it does make a big difference to how they come up.)
But the vinegar trick was something I hadn't heard before. I'll have to give it a try, because it would seem to give some extra leeway with timing. For a home cook, that is an important factor.