All That absolutely fits! It's the 80s prom song, slow dance to break up the onslaught of pop from the previous tracks.
I'm not concerned about the album sounding all over the place. Carly is the throughline and all of these songs have shades of her past work. To my ears it's no different than the eclectic tracklist of Dedicated Side B at this point. I'm also hearing these next to Surrender Your Heart, which offers yet another shade of her/this album. It has the romantic desperation of something like Fever or Gimme Love.
It's good! I don't typically expect the third pre-release to forge new ground but rather just build anticipation with the fanbase and this definitely accomplishes that: the melody on the "talking to yourself" is such a sweet spot. It does feel like it could slot on Emotion Side B easily but the ramped up guitars push it that little bit further.
This is really catchy and effective. I think it's so silly to be disappointed that she's releasing something she excels at - "reinventing" one's sound just for the sake of it usually leads to sub-par albums in my experience. I'd rather her churn out infectious melodies and hooks instead of cosplaying Solar Power, sorry!