Reporters are using that language because they have to. If they come out and say “Kellen Moore will be the Saints next head coach” then that could literally get us hit with penalties by the NFL.
Even if that were accurate, which it most likely isn't, there's still the fact that as of this moment, Kafka, Rizzi and Weaver have not withdrawn their names.
I don't buy for a second that the league would penalize a team for reporters saying sources indicate that Moore will be the hire. In the past, reporters have bragged about their inside sources telling them that Coach X will be the new coach. There is no evidence the league would penalize a team for anything other than a formal press announcement from the team.
There have been definitive reports in the past about how a coach would be announced as the new head coach once the coach was out of the playoffs. I don't recall any team ever being penalized for any of those reports. I searched for the specific policy about announcing hires and didn't find anything on it.
Moore may very well have been told he has the job. I'm not saying that's not the case. I'm simply saying that people are saying what is publicly known proves things they don't actually prove, if you consider everything that is publicly known.