This is about the ATF7 April Fools Joke from 2019
For april fools day, there was 2 jokes, both of which in ATF7.
The first was the Fart in a bottle item, which as of 4/8/19, is still available as a gamepass.
The second is more of a reference to previous game, ATF6:DS, In which the entire map became a forested and grassy area. It was set during the 2nd American Civil war, with the MEB and XOF being the main combatants in this odd event. The map lasted 3 days before being updated back to the original map