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I'm sure that would be the reason.
To the OP - if your chicks are on medicated starter, I see nothing wrong with doing what your friend suggested.
The typical medication used in medicated chick starter is not a true antibiotic, it's a coccidiostat aka an antiprotozoal agent. It inhibits but does not completely halt the reproduction of cocci in the chicks digestive system, giving the chicks immune system time to develop an immunity against coccidia. Simply put, this means the medication(s) prevent the chick from being overwhelmed and dying from coccidiosis while their bodies build the necessary immunities.
For the medication(s) to be effective, the chicks immune system has to be exposed. A body can't develop an immunity to something it's never been exposed to. For my brooder raised chicks, I feed them the medicated and then I get them outside on the ground (that I assume is teeming wth the coccidia since I have other birds) as soon as possible, usually at 2 weeks. My broody raised chicks are unmedicated feed and are living with the adult birds, which means they are gradually being exposed to it in the droppings in the adult birds.
It's very much like a human being given a vaccine against the flu or what-have-you. We are given a small amount of the disease we need an immunity to, so to speak, so that our immune system can begin forming antibodies against it.
So, as outrageous as it seems, it's not a bad idea to get your medicated fed chicks exposed to that which they need to build an immunity to.
ETA: You don't need to dump a ton of manure in with your chicks, but a little or getting them out on the ground on nice days, can't hurt.