At the very beginning I was fascinated by this track because Em gives the coolest vocals here imo. But the song is generally incoherent. The drums sound strange. In some places like a placeholder. Even in the chorus, which in my opinion is the most polished fragment. Verses are super super weird. Using the same riff in the intro, verses and bridge is also not a very interesting. Whole thing sounds unfinished.
I think they released the song on the Deluxe Edition because it was a song that opened the eyes of the band members to Emily's potential joining the band. They emphasized this in an interview and wanted to share this story with fans by sharing this song. After all, Mike won't say in an interview that he chose a weak or unfinished song to release it on an album with only 3 new songs