You have to remember that the Flower Capital, and Onigashima have an overabundance of food. They are hoarding it all to themselves
They have an overabundance of food FOR OROCHI AND THE BEAST PIRATES.
As in it looks like alot of food because it's being shared among very few people.
If all the food that was being used for like 40000 men gets distributed to 4 million citizens then you will notice the lack.
Get it?
Each of Orochi and kaido’s men must be eating 100 times the normal amount if food they require for their to be enough surplus to spread across all of Wano.
100 times.
And remember that's not What luffy promised. Luffy didn't promise tama that he'll get her ENOUGH food to survive. No. He promised to create an abundance for her that she would never ever go hungry and would always eat to her fill.
Meaning luffy is going to require way more than that 100 times
Hell you would have to say the beast pirates have been eating 500 times more than the actual amount required for their surplus yo feed 4 million people TO ABUNDANCE.
I picked 4 million because that's the population of Alabasta (which is a smaller country than wano)
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What if Yamato acts like this to lower Luffy's guard?
Basically Yamato wants to prove Kaido that he/she is worthy.
Luffy can sense emotions if he wants to. He sensed no malice from her so she has no malice