I don't think you read that correctly (or I am misreading what he meant). Looks to me like he is asking if food found in loot is connected to game stage, not that hunger decay rate decreases with it and, afaik, food 'drop' is absolutely effected by game stage.It is not. It's tied to stamina use only.I wonder also if the food drop is linked to game stage too. It seemed to me that day 1-5 we (party of 3) were struggling to keep ourselves fed, even resorting to old sham sandwiches and just guzzling goldenrod tea to deal with it.
It is also worth noting that hunger is not directly tied to GS BUT it is indirectly tied to it. Using transportation still uses less food even with the new calorie burn rates increased in a vehicle and perks like sex rex reduce stamina usage which reduces overall hunger rate.