Yeah the FIA approved them but FOM has not yet, kind of misleading title on the article.
But while the FIA is happy with the Andretti bid and believes it fulfils all the criteria it has laid down, that does not mean that the squad will definitely get a place on the grid.
Andretti now needs to reach a satisfactory commercial deal with FOM, and there has long been a known resistance to the field getting expanded beyond 10 teams.