Did you actually read the study that you cited? It is a several Israeli authors who essentially did the following:
1. Tried to estimate the total volume of food entering Gaza in terms of caloric content. Which they only did very roughly.
2. Estimated the total population of Gaza
3. Divided the second number by the first to conclude that enough food is getting in because the resulting number is above UN daily minimum nutritional requirements.
Which actually does noting to refute reports of widespread famine in Gaza. The real issue with feeding a population is DISTRIBUTION. And the authors did nothing to suggest that the food getting into Gaza is actually being distributed evenly and effectively to the entire population when mobility within Gaza is highly restricted by Israeli combat operations. The study does nothing to address:
1. How much food aid is being destroyed by Israeli bombing of warehouses, storage depots, etc.
2. How much food aid is being mal-distributed by hoarding, diversions to criminal gangs, Hamas, etc.
3. How much food aid is not being distributed within Gaza because aid workers cannot move freely
4. How much food aid is buried under rubble.
5. Whether refugees within Gaza have access to any of this food aid or even the ability to cook things like basic grains if they don't have fuel or cooking supplies.