I’m no expert but Huel protein has 105 calories a scoop so it breaks fast. As far as I’m aware (correct me if I’m wrong) a fast only works if you have zero (or very minimal) calories.
The simple answer is yes. Breaking a fast is not about carbs but about calories. There’s some debate around whether drinks like coffee + milk break a fast.
I think it depends on your goals and what you’re trying to get out of fasting to work out whether this should matter to you.
It will depend on what else you eat throughout the day, but you’re absolutely right that Complete Protein is low enough in carbs to help keep you in ketosis.