I had similar diet advice when I was diagnosed 12 years ago. I too was told diabs is progressing. I followed the advice - I did not consult this forum until 4 years ago, when I had proved the truth of the progressive condition - with chronic tiredness, disabling muscle pain & the beginning of retinopathy.
I came to this forum, cut the carbs, & in 3 months I was well again - & still am. That dietitian has changed her advice because of me, but still thinks 130 g carbs daily is the minimum. I don't think ANY forum contributor has suffered long term effects from a low carb diet.