[Compass Rose]

I am very new to this game however, I may be able to help you understand the underlined statement that you question.

If I am understanding the statement correctly, they are trying to say that the infantry carriers can not stay back, in the clear where it is safer from enemy fire, and later on move very quickly across the battle field, and unloading their own infantry units in the same hex as the enemy positions.

The underlined statement also says that a game player was able to use this game tactic in the past however, they can not use this same game tactic now.

I hope you now understand.