I also agree with CakeEater's words--it's stuff one should think about as a giver, and it's also what a recipient ends up thinking about when the gift/favor becomes less helpful. I think it's good to address it pretty quickly, because the longer the issue goes on, the more resentment and frustration will build up, and the harder it will be to avoid seeing the giver's motivations as negative or feeling entitled to a different gift/favor.
As I said in the other thread, I feel like with close family (however you define that), these should be conversations that can be had without rancor on either side. Unfortunately, we don't know what DH actually said to them. He might have inadvertently offended them. He might have taken the tactic of telling them you guys didn't need any help from now on, so they stopped not only bringing food but also cleaning. He might have felt their reaction was perfectly normal but wasn't good about conveying that to the OP. Them stopping the cleaning could have been only coincidental with stopping the chicken and occurred for an entirely unrelated reason. Maybe they thought, well, when you're sick you often don't care about what you're eating, so having an opinion means you're getting better, therefore, no extra food needed--it's good news. Generally I think the advice to let people handle their own families of origin is a good one, but it does assume that they know how best to handle them, without causing offense or throwing the spouse under the bus or communicating anything the spouse didn't want communicated. Did you talk with DH about how they stopped cleaning, and was it because of the chicken thing?
For the future, I think the advice about being careful not to take a repeated favor for granted is good. So if you're getting X every week, don't ask for Y instead, but just say you're done with X, thanks so much, and see if they offer an alternative. Which they may or may not, and if they don't it doesn't necessarily indicate they're offended.