I can hear a really sick synth slide to a C and F on "slipped into this new rhythm " which makes me think it could be a sus 2 or something on the Bb.
the sliding flute chord you're hearing also contains the Db note. and the chord in general that the rhythm sec does is Bbmin9 (or just Bbmin7 if melody not on 9). the flutes don't play the Ab, just the 2,b3,5 cluster