I think the point the poster you have quoted was making is that it isn't 'just food' for a certain type. And you can't just 'have a chat about it' with some people. There is no point at which some in laws will just become hospitable, rational, functioning people who will put the needs of their family first when a their son or a daughter-in-law finds the correct string of words to tap into their 'reasonable side'.
There is an awful lot of chatter on here about 'being more assertive' with your in laws, which reveals the inability of some people to see the shades of grey, and indeed the threat that many women face when around their partner's family.
For full transparency, I no longer see my ILs who ticked an awful lot of the food problem boxes on this thread (us packing our own food? check. my husband going out to buy more food when we turned up to empty cupboards? check. you just ate an ice cream = no lunch? check. we had a HUGE lunch you won't be wanting dinner? check. Them eating (and drinking) us out of house and home when they came round to us? check.).
However, the reason I no longer see them is not because I was permanently hungry and uncomfortable having what i was eating scrutinised (I have always been a healthy size 10-14 in the time I have known them), though that didn't help, but rather because of the underlying threat that permeated every aspect of their attempts to control us, and particuarly me (it was particuarly gendered...). I don't think they would ever have assaulted me, but they were generally aggressive people, MIL can only speak in a shout for example, FIL spent a lot of time 'accidently' wacking people as he barrelled around the place, the doors and windows were firmly locked by them and they had the key, they didn't like us having our own car/being able to drive (something we both did late in life).
I completely understand the way that the poster has explained the escalation, and trying to see this as a single, isolated incident of violence outside of the context of the weirdness about hosting, money and food is exactly what allows these situations to persist. You need to believe women's versions of their stories involving their in laws and not try to flatten them into a palatable in-laws/parents = accomodating and nurturing vs violent people = bad/to be avoided.