Some bands (like Avenged Sevenfold, for example) use isolation boxes containing their guitar cabinet during their live performances to maintain consistency in their tone across every show on their tour, no matter the room — since the acoustics of each venue are always going to be different. Using isolation boxes live also allows guitar players to block out any venue noise that could be captured through the mic.
What does this mean? It means I’m going with my first instinct: D♭ Lydian, mainly because it’s just, like, in my feelings. But you could also say it’s E♭ Mixolydian if you’re enamored with the strong beat chord, or go back to A♭ major too because of the melodies. Or, why not classify this one as multimodal?