Building a carrier is not the same as having the support infrastructure and experience of operating one(s) in a real-world, sustained, combat environment. The fact that they had Brazilians training their crew for flight ops is telling. It’s a threat, but only just. Otherwise it’s just propaganda… the ability to say they can build a carrier. I guarantee the main purpose of such a carrier will be to “show the flag” and maybe participate in relatively safe coalition operations.