What a wonderful, magical piece. It was a favourite of mine when I was a student: thank you for reminding me of it.
I just played it through for pure pleasure and noticed that I quickly rolled the chord you asked about. I'm sure I always did this and I don't think I ever gave it a moment's thought: it was just what came naturally. Since you asked this specific question, I went back over the passage to see how it would sound if I didn't roll it. I can just stretch that chord, but it's not very comfortable and I don't have so much control over the dynamics of individual fingers in this position.
I find that I prefer the roll: it intensifies the feeling of anguish as you land on that chord. The speed of the roll is important: it needs to be incisive, not languorous or pompously slow. I'm happy to hear that I find myself in good company: Horowitz is also playing a fast roll.
And do remember: rolling chords was the norm back in the 18th and 19th centuries.
But that's only a detail in the whole piece. Much more important is bringing out all the shades of nostalgia, melancholy, mystery and whatever other sentiments you may find in this piece.