I recall this quote, but the problem is that it has not been corroborated in any of the dozens of other previews. I think it's more likely that the author of this one misunderstood how unit linking works.FOUND IT: https://www.rockpapershotgun.com/2016/05/11/civilization-vi-details/
War itself is changing as well. Beach is satisfied with the one unit per tile approach but wanted to eliminate some of the congestion that it caused. To that end, units can now be organised into a formation, which means theyll always move together rather than having to be shuffled across the map one at a time. Formations can be applied to large collections of military units or civilian units and their escorts.