I think the issue is that even though you promise to behave only as is the standard of that camp, yet that is all until you decide to behave so.
Meaning that if you for whatever reason that you are fed up with the more orthodox lifestyle and dress code, you can decide no longer to lead this temporary life style.
Not that I think you will do so, only that the camp has the right to think so.
More so, I would be upset if the camp I send my children hire staff that are below the camps standard, and rely on the staff to change for the summer.
you have to keep in mind that a camp is not just someones personal business venture, parents put a lot of trust in the camp,which includes in hiring staff that are up to the standard in yiddishkeit.