Hey @aylictal, to me it sounds like a Db minor chord (I don’t explicitly hear the 11, but you could be right). In any case, in Bb minor, that would just be a iii chord (with minor quality) which you can get by adding a III chord and borrowing from the Locrian mode.
I went ahead and edited the analysis on the wiki page, where I changed a couple of chords and notes (really enjoyed this chord progression with all the parallel minor chords). Let me know what you think
D♭m7 is sufficient to identify the chord; the G♭ note is a passing tone that does not constitute to the harmony of the chord, but if the F♭, G♭, and A♭ notes are all suspending in the background, then D♭m7/11 (not D♭m11 because no ninth is present) will do, and the most accurate voicing one could get in Hookpad would be G♭7sus4/D♭.
When I try to suspend and inverted chord, the chord converts to the base chord. In other words, If I am starting with a Gb7/Db chord, and I use the radio button to sus4 the chord, it changes the chord to Gbsus4.