Besides removing the biggest Digimons, this deck also runs cost-effective board control options for lower DP Digimons.
[BT4-100] Trident Revolver deletes a Digimon 6000 DP or lower and then plays a tamer for free, which is very viable in such decks that typically run more than 6 tamers.
The new option card [ST7-12] Atomic Blaster costs only 5 to play, is easily one of the most flexible removals around: use it on a threatening LV5 Digimon, or on a few pesky rookies.
[BT5-105] Ultimate Flare is also very common in such decks, with many choosing to play between 2 to 4 copies. Not only are they the deck's best bet against a rookie rush, but also incredibly effective for crippling anti-deletion Digimons such as Craniamon, [BT4-091] Chaosmon Valdur Arm and [BT5-086] Omegamon.
This deck absolutely terrifies me, I hope that more Digimon like BT1 WarGreymon are released in the future that can be a good counter to option heavy decks.
I think it is new trend in BT5 meta. You can check more "megazoo" decks in deck-list.