Itzy definitely isnt a digimon, they've never gotten a pak.
Twice were definetly a digimon back at their peak, they have lost their charting but i think simply cause the gp grew tired of them. They are still widely respected troughout the nation and considered the NGG so they will always be a threat on charts but they've defined lost their digimon status (if thats even possible)
Also i find it unfair to say "twice getting outcharted by rookies". The same thing happened when Twice scored Cheer Up and TT as rookies and outcharted the entire music industry, so its actually very not suprising that a very new big 3 gg with a lot of hype is outcharting a 6 yrs old gg thats been plastered in the tv of all koreans ever since debut.