The point is to count NET carbs. So you need to factor in fiber and sugar alcohols, for example.

According to a 2018 study by Shilpa & Mohan published in the Indian Journal of Medical Research, a person should consume up to 50g of carbs per day to stay in ketosis.

For anyone on the keto diet, it is important to consider the number of “net carbs” in foods.

A person can calculate the number of net carbs in a serving by subtracting the amount of fiber from the total number of carbs. If the food is processed, a person should also subtract half the sugar alcohol content. These quantities are included on food labels.

Reference:

Shilpa, J., & Mohan, V. (2018). Ketogenic diets: Boon or bane?. The Indian journal of medical research, 148(3), 251–253. https://doi.org/10.4103/ijmr.IJMR_1666_18