My experience is closer to yours than to the author of the original post.

1) I have a phonological loop and can easily imagine music.

2) My visuospatial sketchpad (see https://en.wikipedia.org/wiki/Baddeley%27s_model_of_working_...) is almost entirely spatial. I don't know the color of the floor in my kitchen, unless I paid attention to it specifically and verbally in the past. But I can use memory palace successfully.

3) I wonder if for me it's just an undeveloped habit which could be improved: I have dreams with pictures and colors once a few months, and sometimes I see pictures when I'm half asleep, but it's really hard to put myself into that state intentionally.