Tomatoes are about 95% water, 1% fibre, and 4% other carbs (sugars and starches). Even with no added sugar, any tomato sauce is basically all carbs and sugar (if you ignore the water).
Even though we think of tomatoes as a vegetable they’re actually a fruit. Eating a whole bunch of tomato sauce is not much different from eating a bunch of pureed strawberries. Tomatoes just don’t taste as sweet as the strawberries because because they’re more acidic.
I told you not to vote for the Sheep-Eating Wolves Party!