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They both could be right. The only way to find out is to test you blood glucose levels after you eat spuds. Some people tolerate them better than others.
Possibly the point your GP was making is that as a small portion of new or jacket potatoes has a lower GI than the same weight of mash, they will take longer to be digested and have less of rapid impact on your blood glucose levels. Your nurse is correct in that all spuds, whatever their type, are a lump of starch which is basically glucose just waiting to be released into your bloodstream and if you are low carbing then spuds are not on the menu.
Have you got a home meter? If so, test before you eat potatoes, then 2 hours afterwards. Then make up your own mind whether you can eat them, not eat them, or eat small portions of them. We are all different. Personally, I can eat 2 small new spuds, or 2 medium roast spuds, or 6 chips. Any more and my BS goes up and up.
New potatoes are slightly lower in carbohydrate. Waxy ones tend to be lower GI.
Jacket potatoes can be higher GI (though people often put fat on them which lowers GI. They are though usually quite large.
(Just put 150 g of small new potatoes on the scale and then weigh a typical sized jacket potato. I think you will be quite shocked at the comparison)