Concrete Tints' recipes changed even with arcanyx containment installed.

Changed from what?

The tinted concrete doesn't have a recipe. Other mods might also define one, but Arcanyx Containment doesn't (and can't, really) prevent every interaction with every third party mod.

However, Iridescent Industry has a separate setting to totally disable its colored concrete, if you have another mod that provides it.

in the original mod, it's just concrete -> colored concrete. it makes sense if it's a mild conflict with IriIndi.