Just had a look at the nutritional info on the web site...
Their net carbs is total carbs - polyols. Make my usual comment about carb values, they are more likely to be educated guesswork than measured values.
They quote net carbs either per 41 g slice of finished cake or per 100g dry mix and get either 7 g net carb or 1g depending on what you take as a portion. Either way up, the numbers do not really add up (seemingly 700g dry mix is equivalent to a single 41g slice of cake)
When the numbers don't obviously add up then its likely that somebody is playing fast and loose to come up with a headline (where have we seen that before) and so its best to dismiss the whole thing and move on. If they can't be straight with the numbers, what else might they be up to you have got to ask
Anyway £8 for a cake when you have to do most of the work, provide the energy to cook it and carry the risk if it all goes wrong is a bit over the top don't you think?
On the other hand the ingredients dont look too high carb . The lemon cake has
Erythritol (Sweetener), Almond Flour, Chicory Root Fibre, Organic Coconut Flour, Whey Protein (Milk, Sunflower Lecithin), Lemon Powder, Gluten-free Baking powder (Mono Calcium Phosphate, Rice Flour, Sodium Bicarbonate), Himalayan Pnk Salt, Xanthan Gum, Natural Flavouring, Stevia Extract
Allergen information: Contains nuts (Almonds), milk (Whey protein)
But £8 a cake that I have to bake and might not eat. Yes , ive made things that its hmm too sweet , too false so nope .
I also think if i ate cake, crisps, biscuits id want that habit. Still want it but can get by not having them. On holiday and Christmas I might be more tempted.