It is definitely confusing, no doubt.
Just remember, though, that your first indication of too low insulin will be high BG numbers. As T1s, our existence is all about balancing insulin dosage to carb intake and our natural amount of background glucose production.
Dr B himself is the guy who invented basal/bolus insulin dosage to cover our dietary intake of carbs (bolus) with our background production of glucose (basal).
We can completely eliminate our carb intake but we can never completely eliminate our background glucose production, which is why as T1s, we will always require some amount of injected insulin even if we completely starve ourselves. Thankfully, a low carb diet does not mean starvation.
Right now, your son is in his honeymoon period which means his pancreas can still produce insulin. That's why a basal dosage of insulin from Lantus is adequate to cover his daily requirement of injected insulin. You are supplementing his own daily production of insulin with an extremely low amount of injected long acting basal insulin.
Dr B believes this honeymoon period, meaning his own production of insulin, can be extended by greatly decreasing his carb intake. This decreases the burden on his pancreas to produce 5he excess amounts of insulin required to cover high amounts of dietary carbs. Presently, your son simply does not require short acting insulin injected through boluses with his meals to covert the carbs.
Eventually, however, as the islet cells in is pancreas are slowly destroyed by a relentless autoimmune attack, he will require some amount of short acting insulin in boluses to cover his meals.
According to Dr B, however, he can still continue to enjoy the long term benefits of normal BG numbers by continuing to adopt the low carb lifestyle. Since his dietary carb intake will be so low, he simply will not require large amounts of short acting insulin to cove his meals.
According to Dr B, there are countless benefits to a low carb. low bolus insulin dose, lifestyle.