Those products are probably not designed for people who are diabetic, check the carbohydrates of the product.
I tried that years ago when it first came out (not diabetic at the time) and did have some success at losing weight but it was rather like just having something highly processed and very bland and boring. I tried it because I knew someone who lost 7 stone but when I saw them a few years later they had put all the weight back on.
You may be better with some of the products that the NHS programs use as they are tailored for people who are Type 2
Edited to add. I have had a quick look and there are certainly more products and variety and although they are all low calorie and about the same for each one, the carbs vary depending on what it is, a couple I looked at were nearly 40g carbs per portion so it is possible that something as high as that would increase your blood glucose by 5mmol/l.
You may have to choose carefully what products you use.