To be fair - these are store charts. It'd be like asking Virgin Records to compile a list of the(ir) top ten classical albums...
I'm not sure what you mean. I see this as a slice or sample of what jazz music people actually bought last year from a very large online seller of music. Coltrane plays on 2 of the top ten and his influence is felt on 5; this supports not only the fact that he is a musical and cultural icon, but also that assertion that he is very popular, relatively speaking.
I would just add that the enduring popularity and pervasive influence of Coltrane is a direct consequence of his extaordinary technical achievements, his burning improvisational genius, and his uncomprimising artistic integrity. We could always use more of those!
Rory
ps. Hey Notes...try Prez/Getz