The club are working to their timetable not anyone else's and there's always going to be photoshoot and interview as it's 2024. Barco won't be linking up with the squad any time soon due to the Olympic qualifiers so there's no rush to make the announcement. I'm sure they would've liked to have...
I did know they had a long and interesting history but was unaware of the nationalisation. Hopefully, this will all be covered in Barco's induction video.
I imagine the club wouldn't have said anything if it hadn't been for the Argentinian journos announcing it, followed swiftly by the global Twittersphere