My only thought about Uncanny X-Men #215-219 being included is that the titles of the Omnibus volumes can sometimes be misleading. Consider the case of the Claremont/Lee volume 1 and the fact that Lee had a relatively small number of issues in the volume. That said, the Writer/Artist listing is hopefully/presumably truncated in the listing.

Reviews, Adventures, Advice, and Creative Works:

http://www.studioremarkable.com/