Although India is a bigger country than Pakistan, it is no more capable of sustained warfare than Pakistan. As far as I know India's ammunition stockpile, energy stockpile, industrial production capacity, and social organization capacity are all weak.
It is China that really has a strong capacity for a protracted war. China will give full support to Pakistan and eventually it will be India who will not be able to tolerate a protracted war.
You shouldn't say "both with and without Chinese help". Anyone who is familiar with the history of China and Pakistan knows that it is necessarily "with" not "withou".
That's what you don't understand what that Army War College article was talking about.
Logistic is not how much you can handle in general, but theater wise, how do you push stuff into the frontline so your people fighting won't run out of what we called 1, 3, 5. (Food Fuel and Ammunition)
You can have 2000 road leading into a country, but the country itself (or as the AWC reference to it, the float) IS the place your final logistic operation. Now, you can over supply your troop, but say for a city under siege, there are only 2 road in a 2 road out (that's hypothetical), then regardless of your supply issue, you can only send 2 trucks in at the same time. China could have sent 6 million truck full of supply to Pakistan, but to supply that particular village, you can only send 2.
Now, that's 2 dimensions, we now go into 3 dimension, you have 2 cities (City A and City B) in the front line, and you have a log base, the 2 cities both with 2 road in and 2 road out, and the two road are connected to each other, which mean if I float 2 trucks from my Log Base to city A. that same truck can travel to City B via those road, or I can simply send two truck to City B directly. Now you have a buffer, If City A is under siege, you have an alternative. so if either one of those cities is under siege, you can still direct supply from the other city instead of sending nothing.
Now going back to the original question, if I have a bigger country, I can have more logistical solution to the same problem than if you are a smaller country, because of the difference if I connect 100 cities with each other than if I just connect 50. That is what we called "Bottleneck Effect" that is why when we invaded France in Normandy, we need to keep the supply rolling and that was an issue (Read Red Ball Express) because you are geographically limited in your logistical operation by the Area of Operation, ther are 5 beaches, not connect together, which mean whatever we brought in, it will have to be 1 at a time, until we connect those beaches together and then expanded it, this is not going to be solve until then, it's not because we did not make enough bullet or guns or food or whatever putting into the battle, you can make 200 million trucks and have people staff it, you were right, China can produce probably 1000 times Indian production and send enough to Pakistan, but you are as good as how many roads and how many depot you have, otherwise it's just overflowing, supplies that sitting at the rear at depot is pointless.. And that is also why Russia being more productive can still drag on to the war in Ukraine at the opening salvo back in 2022, because they fail to solve the bottleneck.