Technically, it's not a debt, but you have the potential to be in that debt. That is why I mentioned the time frame: if you keep the higher limit and lower utilization for longer periods, the bank will consider you as a person with credit discipline.
But if you have acquired that limit in a short span of time, you are potentially a risk for new lenders.
Banks do consider the current limit and your annual income when calculating the limit for their product.
For people with relatively lower credit histories, if they already have a higher limit w.r.t annual income, limits for new products will be lower.